American and British English spelling differences
One of the ways in which American English and British English differ is in spelling.
Historical origins 
In the early 18th century, English spelling was not standardised. Differences became noticeable after the publishing of influential dictionaries. Today's British English spellings follow, for the most part, those of Samuel Johnson's A Dictionary of the English Language (1755), whereas many American English spellings follow Noah Webster's An American Dictionary of the English Language (1828).
Webster was a strong proponent of English spelling reform for reasons both philological and nationalistic. Many spelling changes proposed in the United States by Webster himself, and in the early 20th century by the Simplified Spelling Board, never caught on. Among the spelling reform supporters in England, the influence of those who preferred the Norman (or Anglo-French) spellings of words proved to be decisive. Later spelling adjustments in the United Kingdom had little effect on today's American spellings and vice-versa.
The spelling systems of most Commonwealth countries and Ireland, for the most part, closely resemble the British system. In Canada, the spelling system can be said to follow both British and American forms, and Canadians are somewhat more tolerant of foreign spellings when compared with other English-speaking nationalities. Australian spelling has also strayed somewhat from British spelling, with some American spellings incorporated as standard.
Latin-derived spellings 
-our, -or 
Most words ending in an unstressed -our in British English (e.g. colour, flavour, harbour, honour, humour, labour, neighbour, rumour) end in -or in American English (color, flavor, harbor, honor, humor, labor, neighbor, rumor). Wherever the vowel is unreduced in pronunciation, e.g. contour, velour, paramour and troubadour the spelling is the same everywhere.
Most words of this kind come from Latin non-agent nouns having nominative -or. These words were first borrowed into English from early Old French and the ending was spelled -or or -ur. After the Norman conquest of England, the ending became -our in Anglo-French to try to represent the Old French pronunciation, though color has sometimes been used in English since the 15th century. The -our ending was not only used in English borrowings from Anglo-French, but was also applied to the earlier borrowings that had used -or. After the Renaissance, new borrowings from Latin were taken up with their original -or ending and many words once ending in -our (for example, chancellour and governour) went back to -or. Many words of the -our/or group do not have a Latin counterpart; for example, armo(u)r, behavio(u)r, harbo(u)r, neighbo(u)r; also arbo(u)r, meaning "shelter", though senses "tree" and "tool" are always arbor, a false cognate of the other word. Some 16th- and early 17th-century British scholars indeed insisted that -or be used for words from Latin (e.g. color) and -our for French loans; but in many cases the etymology was not clear, and therefore some scholars advocated -or only and others -our only.
Webster's 1828 dictionary had only -or and is given much of the credit for the adoption of this form in the United States. By contrast, Johnson's 1755 dictionary used -our for all words still so spelled in Britain (like colour), but also for words where the u has since been dropped: ambassadour, emperour, governour, perturbatour, inferiour, superiour; errour, horrour, mirrour, tenour, terrour, tremour. Johnson, unlike Webster, was not an advocate of spelling reform, but chose the spelling best derived, as he saw it, from among the variations in his sources. He preferred French over Latin spellings because, as he put it, "the French generally supplied us". English speakers who moved to America took these preferences with them, and H. L. Mencken notes that "honor appears in the 1776 Declaration of Independence, but it seems to have got there rather by accident than by design. In Jefferson's original draft it is spelled honour." In Britain, examples of color, flavor, behavior, harbor and neighbor barely appear in Old Bailey court records from the 17th and 18th centuries, whereas there are thousands of examples of their -our counterparts. One notable exception is honor. Honor and honour were equally frequent in Britain until the 17th century; Honor still is, in the UK, the usual spelling as a person's name.
- Derivatives and inflected forms
In derivatives and inflected forms of the -our/or words, British usage depends on the nature of the suffix used. The u is kept before English suffixes that are freely attachable to English words (for example in neighbourhood, humourless and savoury) and suffixes of Greek or Latin origin that have been naturalised (for example in favourite, honourable and behaviourism). However, before Latin suffixes that are not freely attachable to English words, the u:
- may be dropped, for example in honorary, honorific, honorist, vigorous, humorous, laborious and invigorate;
- may be either dropped or kept, for example in colo(u)ration and colourise (alt. colorize)); or
- may be kept, for example in colourist.
American usage, in most cases, keeps the u in the word glamour, which comes from Scots, not Latin or French. Glamor is sometimes used in imitation of the spelling reform of other -our words to -or. Nevertheless, the adjective glamorous often drops the first "u". Saviour is a somewhat common variant of savior in the US. The British spelling is very common for honour (and favour) in the formal language of wedding invitations in the US. The name of the Space Shuttle Endeavour has a u in it as the spacecraft was named after Captain James Cook's ship, HMS Endeavour. The special car on Amtrak's Coast Starlight train is known as the Pacific Parlour car, not Pacific Parlor. Similarly, names such as Pearl Harbor are spelled the same in Britain.
The name of the herb savory is thus spelled everywhere, although the related adjective savo(u)ry, like savo(u)r, has a u in the UK. Honor (the name) and arbor (the tool) have -or in Britain, as mentioned above. As a general noun, rigour // has a u in the UK; the medical term rigor (often //) does not, such as in "rigor mortis", which is Latin. Derivations of "rigour/rigor" such as "rigorous", however, are typically spelled without a "u" even in the UK. Words with the ending -irior, -erior or similar are spelled thus everywhere.
- Commonwealth usage
Commonwealth countries normally follow British usage. Canadian English officially uses the -our ending and our in derivatives and inflected forms. However, owing to the close historic, economic, and cultural relationship with the United States, -or endings are also sometimes used. Throughout of the late 19th and early to mid 20th century, most Canadian newspapers chose to use the American usage of -or endings, originally to save time and money in the era of manual movable type. However, in the 1990s, the majority of Canadian newspapers officially updated their spelling policies to the British usage of -our. This coincided with a renewed interest in official Canadian English, and the release of the updated Gage Canadian Dictionary in 1997 and the first Oxford Canadian Dictionary in 1998. Historically, most libraries and educational institutions in Canada have supported the use of the Oxford English Dictionary rather the American Webster's Dictionary. Today, the use of British English spellings in Canadian English is viewed by many Canadians as one of the cultural uniquenesses of Canada (especially when compared to the United States).
In Australia, -or endings enjoyed some use throughout the 19th century and in the early 20th century, Like in Canada though, most major Australian newspapers have switched from "-or" endings to "-our" endings. The "-our" spelling is taught in schools nationwide as part of the Australian curriculum. The most notable countrywide use of the -or ending is for the Australian Labor Party, which was originally called "the Australian Labour Party" (name adopted in 1908), but was frequently referred to as both "Labour" and "Labor". The "Labor" was adopted from 1912 onward due to the influence of the American labo(u)r movement. and King O'Malley Aside from that, -our is now almost universal in Australia. New Zealand English, while sharing some words and syntax with Australian English, follows British usage.
-re, -er 
In British English, some words from French, Latin or Greek end with a consonant followed by -re, with the -re unstressed and pronounced /əɹ/. In American English, most of these words have the ending -er. The difference is most common for words ending -bre or -tre: British spellings calibre, centre, fibre, goitre, litre, lustre, manoeuvre, meagre, metre, mitre, nitre, ochre, reconnoitre, sabre, saltpetre, sepulchre, sombre, spectre, theatre (see exceptions) and titre all have -er in American spelling.
Most English words that today use -er were spelled -re at one time or another. In American English, almost all of these have become -er, while in British English only some of them have. The latter include chapter, December, disaster, enter, filter, letter, member, minister, monster, November, number, October, oyster, perimeter, parameter, powder, proper, September, sober and tender.
The e preceding the r is kept in American-derived forms of nouns and verbs, for example, fibers, reconnoitered, centering, which are fibres, reconnoitred and centring respectively in British English. Centring is an interesting example, since it is still pronounced as three syllables in British English (/ˈsɛntərɪŋ/), yet there is no vowel letter in the spelling corresponding to the second syllable. It is dropped for other derivations, for example, central, fibrous, spectral. However, such dropping cannot be deemed proof of an -re British spelling: for example, entry and entrance come from enter, which has not been spelled entre for centuries.
The difference relates only to root words; -er rather than -re is universal as a suffix for agentive (reader, winner, user) and comparative (louder, nicer) forms. One outcome is the British distinction of meter for a measuring instrument from metre for the unit of length. However, while "poetic metre" is often -re, pentameter, hexameter etc. are always -er.
Many other words have -er in British English. These include Germanic words like anger, mother, timber and water and Romance words like danger, quarter and river.
The ending -cre, as in acre, lucre, massacre and mediocre, is used in both British and American English to show that the c is pronounced /k/ rather than /s/. The spellings ogre and euchre are also the same in both British and American English.
Theater is the prevailing American spelling used to refer to both the dramatic arts and buildings where stage performances and screenings of films take place (i.e. "movie theaters"); for example, a national newspaper such as The New York Times would use theater in its entertainment section. However, the spelling theatre appears in the names of many New York City theaters on Broadway (cf. Broadway theatre) and elsewhere in the United States. In 2003, the American National Theatre was referred to by The New York Times as the "American National Theater", but the organization uses "re" in the spelling of its name. The John F. Kennedy Center for the Performing Arts in Washington D.C. has the more common American spelling theater in its references to The Eisenhower Theater, part of the Kennedy Center. Some cinemas outside New York also use the theatre spelling. (Note also that the word "theater" in American English is a place where stage performances and screenings of films take place, but in British English a "theatre" is where stage performances take place but not film screenings - these take place in a cinema.)
Some placenames in the United States use Centre in their names. Examples include the Stonebriar Centre mall, the cities of Rockville Centre and Centreville, Centre County and Centre College. Sometimes, these places were named before spelling changes but more often the spelling merely serves as an affectation.
For British accoutre, the American practice varies: the Merriam-Webster Dictionary prefers the -re spelling, but the The American Heritage Dictionary of the English Language prefers the -er spelling.
More recent French loanwords keep the -re spelling in American English. These are not exceptions when a French-style pronunciation is used (/rə/ rather than /ər/), as with double entendre, genre and oeuvre. However, the unstressed /ər/ pronunciation of an -er ending is used more (or less) often with some words, including cadre, macabre, maître d', Notre Dame, piastre, and timbre.
- Commonwealth usage
The -re endings are mostly standard throughout the Commonwealth. The -er spellings are recognized as minor variants in Canada, partly due to American influence, and are sometimes used in proper names (such as Toronto's controversially named Centerpoint Mall).
-ce, -se 
For advice / advise and device / devise, American English and British English both keep the noun/verb distinction (where the pronunciation is -[s] for the noun and -[z] for the verb). For licence / license or practice / practise, British English also keeps the noun/verb distinction (the two words in each pair are homophones with -[s] pronunciation, though). On the other hand, American English uses license and practice for both nouns and verbs (with -[s] pronunciation in both cases too).
American English has kept the Anglo-French spelling for defense and offense, which are usually defence and offence in British English. Likewise, there are the American pretense and British pretence; but derivatives such as defensive, offensive, and pretension are always thus spelled in both systems.
Australian and Canadian usage generally follows British.
-xion, -ction 
The spelling connexion is now rare in everyday British usage, its use lessening as knowledge of Latin lessens, and it is not used at all in the US: the more common connection has become the standard worldwide. According to the Oxford English Dictionary the older spelling is more etymologically conservative, since the original Latin word had -xio-. The American usage comes from Webster, who abandoned -xion in favour of -ction by analogy with verbs like connect. Connexion was still the house style of The Times of London until the 1980s and was still used by the British Post Office for its telephone services in the 1970s, but had by then been overtaken by connection in regular usage (for example, in more popular newspapers).
Complexion (which comes from complex) is standard worldwide and complection is rare. However, the adjective complected (as in "dark-complected"), although sometimes objected to, is standard in the US as an alternative to complexioned, but is not used in this way in the UK, although there is a rare usage to mean complicated.
Greek-derived spellings 
-ise, -ize (-isation, -ization) 
American spelling avoids -ise endings in words like organize, realize and recognize. British spelling uses both -ize and -ise (organise / organize, realise / realize, recognise / recognize), and the ratio between -ise and -ize stands at 3:2 in the British National Corpus. In Australia and New Zealand -ise spellings strongly prevail: the -ise form is preferred in Australian English at a ratio of about 3:1 according to the Macquarie Dictionary.
Worldwide, -ize endings prevail in scientific writing and are commonly used by many international organizations, such as the International Organization for Standardization and the World Health Organization. The European Union switched from -ize to -ise some years ago in its English language publications, meaning that -ize spellings are found in older legislative acts and -ise spellings in more recent ones. Proofreaders at the EU's Publications Office ensure consistent spelling in official publications such as the Official Journal (where legislation and other official documents are published), but the -ize spelling may be found in other documents.
- British usage
British English using -ize is known as Oxford spelling and is used in publications of the Oxford University Press, most notably the Oxford English Dictionary (OED). It can be identified using the registered IANA language tag en-GB-oed. The OED lists the -ise form separately, as "a frequent spelling of -IZE", and refuses to list the -ise spellings even as alternatives in the individual entries for words such as realize. It firmly deprecates using -ise for words of Greek origin, saying, "[T]he suffix...whatever the element to which it is added, is in its origin the Greek -ιζειν, Latin -izāre; and, as the pronunciation is also with z, there is no reason why in English the special French spelling in -iser should be followed, in opposition to that which is at once etymological and phonetic." It says, "Some have used the spelling -ise in English, as in French, for all these words, and some prefer -ise in words formed in French or English from Latin elements, retaining -ize for those of Greek composition." Noah Webster rejected -ise for the same reasons. Henry Watson Fowler's A Dictionary of Modern English Usage quotes the OED and recommends the -ize spelling. Horace Hart in Hart's Rules for Compositors and Readers at the University Press, Oxford also recommended -ize.
Perhaps as a reaction to the ascendancy of American spelling, the -ize spelling is often seen in the UK as an Americanism, and -ise is more commonly used in UK mass media and newspapers, including The Times, The Daily Telegraph and The Economist. Meanwhile, -ize is used in many British-based academic publications, such as Nature, the Biochemical Journal and The Times Literary Supplement.
Some verbs ending in -ize or -ise do not come from Greek -ιζειν, and their endings are therefore not interchangeable:
- Some words take only the -z- form worldwide, for example capsize, seize (except in the legal phrase to be seised of/to stand seised to), size and prize (only in the "appraise" sense)
- Others take only -s- worldwide: advise, arise, comprise, compromise, demise, despise, devise, disguise, excise, exercise, franchise, guise, incise, revise, rise, supervise, surmise, televise, and wise.
- One special case is the verb prise (meaning to force or lever), which is spelled prize in the US and prise everywhere else, including Canada, although in North American English it is almost always replaced by pry, a back-formation from or alteration of prise.
- A house may be burglarized in North America, but in the UK it would be burgled, not burglarised.
- Commonwealth usage
In Canada, the -ize ending is standard, whereas in Australia and other Commonwealth countries, the -ise ending is preferred.
-yse, -yze 
Analyse seems to have been the more common spelling in 17th- and 18th-century English, but many of the great dictionaries of that time – John Kersey's of 1702, Nathan Bailey's of 1721 and Samuel Johnson's of 1755 – prefer analyze. In Canada, -yze prevails, just as in the US. In Australia and New Zealand, -yse stands alone.
English verbs ending in -lyse or -lyze are not similar to the Greek verb, which is λύω lúō ("I release"). Instead they come from the noun form λύσις lysis with the -ise or -ize suffix. For example, analyse comes from French analyser, formed by haplology from the French analysiser, which would be spelled analysise or analysize in English.
Hart's Rules for Compositors and Readers at the University Press, Oxford states: "In verbs such as analyse, catalyse, paralyse, -lys- is part of the Greek stem (corresponding to the element -lusis) and not a suffix like -ize. The spelling -yze is therefore etymologically incorrect, and must not be used, unless American printing style is being followed".
-ogue, -og 
British and Commonwealth English uses the ending -logue and -gogue while American English usually uses the ending -log and -gog for words like analog(ue), catalog(ue), dialog(ue), demagog(ue), pedagog(ue), monolog(ue), homolog(ue), synagog(ue), etc. Catalogue is sometimes used in the US but catalog is more common (thus the inflected forms, cataloged and cataloging vs. catalogued and cataloguing). Analog is standard for the adjective, but both analogue and analog are current for the noun; in all other cases the -gue endings strongly prevail, for example monologue, except for such expressions as dialog box in computing, which are also used in the UK. In Australia, analog is used in its technical and electronic sense, as in analog electronics. In Canada and New Zealand, analogue is used, but analog has some currency as a technical term (e.g. in electronics, as in "analog electronics" as opposed to "digital electronics" and some video-game consoles might have an analog stick). Synagog is seldom used in the US to describe a Jewish place of worship, even by American Jews, except in an Orthodox sense; the usual term is temple.
The -ue is dropped worldwide when forming related words like analogy, analogous, and analogist.
American English retains the -gue on the words tongue, vague and league.
ae and oe 
Many words that are written with ae/æ or oe/œ in British English are written with just an e in American English. The sound in question is /iː/ or /ɛ/ (or unstressed /ɨ/). Examples (with non-American letter in bold): anaemia, anaesthesia, caesium, diarrhoea, encyclopaedia, faeces, foetal, gynaecology, haemophilia, leukaemia, oesophagus, oestrogen, orthopaedic, palaeontology, paediatric. Oenology is acceptable in American English but is deemed a minor variant of enology, whereas although archeology exists in American English, the British version archaeology is probably more common.
Words that can be spelled either way in American English include aesthetics and archaeology (which usually prevail over esthetics and archeology), as well as palaestra, for which the simplified form palestra is described by Merriam-Webster as "chiefly Brit[ish]."
Words that can be spelled either way in British English include encyclopaedia, homoeopathy, mediaeval and foetus. The spellings foetus and foetal are Britishisms based on a mistaken etymology. The etymologically correct original spelling fetus reflects the Latin original and is the standard spelling in medical journals worldwide. The British medical community and The Economist magazine deem foetus/foetal unacceptable for journal articles and the like.
The Ancient Greek diphthongs <αι> and <οι> were transliterated into Latin as <ae> and <oe>. The ligatures æ and œ were introduced when the sounds became monophthongs, and later applied to words not of Greek origin, in both Latin (for example, cœli) and French (for example, œuvre). In English, which has borrowed words from all three languages, it is now usual to replace Æ/æ with Ae/ae and Œ/œ with Oe/oe. In many cases, the digraph has been reduced to a lone e in all varieties of English: for example, oeconomics, praemium, and aenigma. In others, it is kept in all varieties: for example, phoenix, and usually subpoena, but Phenix in Virginia. This is especially true of names: Caesar, Oedipus, Phoebe etc. There is no reduction of Latin -ae plurals (e.g. larvae); nor where the digraph <ae>/<oe> does not result from the Greek-style ligature: for example, maelstrom, toe. The British form aeroplane is an instance (compare other aero- words such as aerosol). The now chiefly North American airplane is not a respelling but a recoining, modeled after airship and aircraft. The word airplane dates from 1907, at which time the prefix aero- was trisyllabic, often written aëro-.
- Commonwealth usage
In Canada, e is usually preferred over oe and often over ae, but oe and ae are sometimes found in the academic and scientific writing as well as government publications (for example the fee schedule of the Ontario Health Insurance Plan). In Australia, encyclopedia and medieval are spelled with e rather than ae, as with American usage, and the Macquarie Dictionary also notes an growing tendency towards replacing ae and oe with e worldwide. Elsewhere, the British usage prevails, but the spellings with just e are increasingly used. Manoeuvre is the only spelling in Australia, and the most common one in Canada, where maneuver and manoeuver are also sometimes found.
- In other languages
The American spelling is closer to the usage in a number of other languages using the Latin alphabet. For instance, almost all Romance languages (which tend to have more phonemic spelling) lack the ae and oe spellings (a notable exception being French), as do Swedish, Polish, and others, while Dutch uses them sometimes ("ae" is rare, but "oe" is the normal spelling of the sound [u], while written "u" represents either the sound [y] or [ʏ]). Danish, Icelandic, Norwegian and some others keep the original ligatures. In German, through umlauts, is retained as its equivalent of the ligature, for when written without the umlaut. These words resemble the British usage (i.e. ä becomes ae and ö becomes oe). Likewise, Hungarian uses "é" as a replacement for "ae" (although it becomes "e" sometimes), and the special character "ő" (sometimes "ö") for "oe".
Doubled consonants 
Doubled in British English 
The final consonant of an English word is sometimes doubled in both American and British spelling when adding a suffix beginning with a vowel, for example strip/stripped, which prevents confusion with stripe/striped and shows the difference in pronunciation (see digraph). Generally, this happens only when the word's final syllable is stressed and when it also ends with a lone vowel followed by a lone consonant. In British English, however, a final -l is often doubled even when the final syllable is unstressed. This exception is no longer usual in American English, seemingly because of Noah Webster. The -ll- spellings are nevertheless still deemed acceptable variants by both Merriam-Webster Collegiate and American Heritage dictionaries.
- The British English doubling is used for all inflections (-ed, -ing, -er, -est) and for the noun suffixes -er and -or. Therefore, British English usage is cancelled, counsellor, cruellest, labelled, modelling, quarrelled, signalling, traveller, and travelling. Americans usually use canceled, counselor, cruelest, labeled, modeling, quarreled, signaling, traveler, and traveling.
- The word parallel keeps a single -l- in British English, as in American English (paralleling, unparalleled), to avoid the unappealing cluster -llell-.
- Words with two vowels before a final l are also spelled with -ll- in British English before a suffix when the first vowel either acts as a consonant (equalling and initialled; in the United States, equaling or initialed), or belongs to a separate syllable (British fu•el•ling and di•alled; American fu•el•ing and di•aled).
- British woollen is a further exception due to the double vowel (American: woolen). Also, wooly is accepted in American English, though woolly prevails in both systems.
- Endings -ize /-ise, -ism, -ist, -ish usually do not double the l in British English; for example, normalise, dualism, novelist, and devilish.
- Exceptions: tranquillise; duellist, medallist, panellist, and sometimes triallist in British English.
- For -ous, British English has a single l in scandalous and perilous, but the "ll" in marvellous and libellous.
- For -ee, British English has libellee.
- For -age, British English has pupillage but vassalage.
- American English sometimes has an unstressed -ll-, as in the UK, in some words where the root has -l. These are cases where the change happens in the source language, which was often Latin. (Examples: bimetallism, cancellation, chancellor, crystallize, excellent, tonsillitis, and raillery.)
- All forms of English have compelled, excelling, propelled, rebelling (notice the stress difference); revealing, fooling (note the double vowel before the l); and hurling (consonant before the l).
- Canadian and Australian English mostly follow British usage.
Among consonants other than l, practice varies for some words, such as where the final syllable has secondary stress or an unreduced vowel. In the United States, the spellings kidnaped and worshiped, which were introduced by the Chicago Tribune in the 1920s, are common. Kidnapped and worshipped are the only standard British spellings.
- British calliper or caliper; American caliper.
- British jewellery; American jewelry. The standard pronunciations (//) do not reflect this difference. According to Fowler, jewelry used to be the "rhetorical and poetic" spelling in the UK, and was still used by The Times into the mid-20th Century. Canada has both, but jewellery is more often used. Likewise, the Commonwealth (including Canada) has jeweller and the US has jeweler for a jewel(le)ry seller.
Doubled in American English 
Conversely, there are words where British writers prefer a single l and Americans a double l. In American usage, the spelling of words is usually not changed when they form the main part (not prefix or suffix) of other words, especially in newly formed words and in words whose main part is in common use. Words with this spelling difference include wil(l)ful, skil(l)ful, thral(l)dom, appal(l), fulfil(l), fulfil(l)ment, enrol(l)ment, instal(l)ment. These words have monosyllabic cognates always written with -ll: will, skill, thrall, pall, fill, roll, stall, still. Cases where a single l nevertheless occurs in both American and British English include null→annul, annulment; till→until (although some prefer "til" to reflect the single L in "until", sometimes using an apostrophe ['til]); and others where the connection is not clear or the monosyllabic cognate is not in common use in American English (e.g. null is used mainly as a technical term in law, mathematics, and computer science).
In the UK, ll is sometimes used in distil(l), instil(l), enrol(l), and enthral(l)ment, and often in enthral(l), all of which are always spelled this way in American usage. The former British spellings instal, fulness, and dulness are now quite rare. The Scottish tolbooth is cognate with toll booth, but it has a distinct meaning.
In both American and British usages, words normally spelled -ll usually drop the second l when used as prefixes or suffixes, for example full→useful, handful; all→almighty, altogether; well→welfare, welcome; chill→chilblain.
Johnson wavered on this issue. His dictionary of 1755 lemmatises distil and instill, downhil and uphill.
Dropped e 
British English sometimes keeps silent e when adding suffixes where American English does not. Generally speaking, British English drops it in only some cases in which it is needed to show pronunciation whereas American English only uses it where needed.
- British prefers ageing, American usually aging (compare raging, ageism). For the noun or verb "route", British English often uses routeing, but in America routing is used. The military term rout forms routing everywhere. However, all of these words form "router", whether used in the context of carpentry, data communications, or military. (e.g. "Attacus was the router of the Huns at ....")
Both forms of English keep the silent e in the words dyeing, singeing, and swingeing (in the sense of dye, singe, and swinge), to distinguish from dying, singing, swinging (in the sense of die, sing, and swing). In contrast, the verb bathe and the British verb bath both form bathing. Both forms of English vary for tinge and twinge; both prefer cringing, hinging, lunging, syringing.
- Before -able, British English prefers likeable, liveable, rateable, saleable, sizeable, unshakeable, where American practice prefers to drop the -e; but both British and American English prefer breathable, curable, datable, lovable, movable, notable, provable, quotable, scalable, solvable, usable, and those where the root is polysyllabic, like believable or decidable. Both systems keep the silent e when it is needed to preserve a soft c, ch, or g, such as in traceable, cacheable, changeable; both usually keep the "e" after -dge, as in knowledgeable, unbridgeable, and unabridgeable ("These rights are unabridgeable").
- Both abridgment and the more regular abridgement are current in the US, only the latter in the UK. Likewise for the word lodg(e)ment. Both judgment and judgement are in use interchangeably everywhere, although the former prevails in the US and the latter prevails in the UK except in the practice of law, where judgment is standard. This also holds for abridgment and acknowledgment. Both systems prefer fledgling to fledgeling, but ridgeling to ridgling. Both acknowledgment, acknowledgement, abridgment and abridgement are used in Australia; the shorter forms are endorsed by Australian governments.
- The word "blue" always drops the "e" when forming "bluish" or "bluing".
Past tense differences 
In Great Britain, Ireland, Australia and New Zealand it is more common to end some past tense verbs with a "t" as in learnt or dreamt rather than learned or dreamed. However, such spellings are also found in North America. The "t" past tenses may have been influenced by German past tenses; for example dreamt has an irregular ending found in no other English word, which is probably derived from the German geträumt.
Several verbs have different past tenses or past participles in American and British English:
- The past tense of the verb "to dive" is most commonly found as "dived" in British, Australian and New Zealand English. "Dove" is usually used in its place in American and Canadian English. Both terms are understood, and may be found either in minority use or in regional dialect.
- The past participle and past tense of the verb "to get" is most commonly found as "got" in British and New Zealand English. "Gotten" is also used in its place in American and Canadian, and occasionally in Australian English, as a past participle, though "got" is widely used as a past tense. The main exception is in the phrase "ill-gotten", which is widely used in British, Australian and New Zealand English. Both terms are understood, and may be found either in minority use or in regional dialect. This does not affect "forget" and "beget", whose past participles are "forgotten" and "begotten" in all varieties.
Different spellings for different meanings 
- dependant or dependent: British dictionaries distinguish between dependent (adjective) and dependant (noun). In the US, dependent is usual for both noun and adjective, notwithstanding that dependant is also an acceptable variant for the noun form in the US.
- disc or disk: Traditionally, disc used to be British and disk American. Both spellings are etymologically sound (Greek diskos, Latin discus), although disk is earlier. In computing, disc is used for optical discs (e.g. a CD, Compact Disc; DVD, Digital Versatile/Video Disc), by choice of the group that coined and trademarked the name Compact Disc, while disk is used for products using magnetic storage (e.g. hard disks or floppy disks, also known as diskettes). For this limited application, these spellings are used in both the US and the Commonwealth. Solid-state devices also use the spelling "disk".
- enquiry or inquiry: According to Fowler, inquiry should be used in relation to a formal inquest, and enquiry to the act of questioning. Many (though not all) British writers maintain this distinction; the OED, on the other hand, lists inquiry and enquiry as equal alternatives, in that order. Some British dictionaries, such as Chambers 21st Century Dictionary, present the two spellings as interchangeable variants in the general sense, but prefer inquiry for the "formal inquest" sense. In the US, only inquiry is commonly used; the title of the National Enquirer, as a proper name, is an exception. In Australia, inquiry and enquiry are often interchangeable. Both are current in Canada, where enquiry is often associated with scholarly or intellectual research.
- ensure or insure: In the UK (and Australia and New Zealand), the word ensure (to make sure, to make certain) has a distinct meaning from the word insure (often followed by against – to guarantee or protect against, typically by means of an "insurance policy"). The distinction is only about a century old. In American usage, insure may also be used in the former sense, but ensure may not be used in the latter sense. According to Merriam-Webster's usage notes, ensure and insure "are interchangeable in many contexts where they indicate the making certain or [making] inevitable of an outcome, but ensure may imply a virtual guarantee <the government has ensured the safety of the refugees>, while insure sometimes stresses the taking of necessary measures beforehand <careful planning should insure the success of the party>."
- insurance or assurance: In the business of risk transfer, American English speakers will normally refer to life insurance or fire insurance. In British English, "assurance" refers to risk associated with certainty, such as covering death (death is inevitable), whereas "insurance" refers to uncertainty (such as a home insurance policy). In British English "life insurance" is used for a policy covering uncertainty (for example, a pianist's hands may be covered under "life insurance"). Canadian speakers remain more likely than US speakers to use assurance. Assurance is also used for the legal names of several Canadian insurance companies, such as Canada Life Financial or Great-West Life.
- matt or matte: In the UK, matt refers to a non-glossy surface, and matte to the motion-picture technique; in the US, matte covers both.
- programme or program: The British programme is a 19th-century French version of the original program. Program first appeared in Scotland in the 17th century and is the only spelling found in the US. The OED entry, written around 1908 and listing both spellings, said program was preferable, since it conformed to the usual representation of the Greek as in anagram, diagram, telegram etc. In British English, program is the common spelling for computer programs, but for other meanings programme is used. New Zealand also follows this pattern. In Australia, program has been endorsed by government writing standards for all meanings since the 1960s, and is listed as the official spelling in the Macquarie Dictionary; see also the name of The The Micallef P(r)ogram(me). In Canada, program prevails, and the Canadian Oxford Dictionary makes no meaning-based distinction between it and programme. However, some Canadian government documents nevertheless use programme for all meanings of the word – and also to match the spelling of the French equivalent.
- tonne or ton: In the UK, Australia, Canada and New Zealand, the spelling tonne refers to the metric unit (1000 kilograms), whereas in the US the same unit is called a metric ton. The unqualified ton usually refers to the long ton (2,240 pounds (1,020 kg)) in the UK and to the short ton (2,000 pounds (910 kg)) in the US (but note that the tonne and long ton differ by only 1.6%, and are roughly interchangeable when accuracy is not critical; ton and tonne are usually pronounced the same in speech).
See also meter/metre, for which there is a British English distinction between these etymologically related forms with different meanings but the standard American spelling is "meter". The spelling used by the International Bureau of Weights and Measures is "metre". This spelling is also the usual one in most English-speaking countries, but only the spelling "meter" is used in American English, and this is officially endorsed by the United States.
Different spellings for different pronunciations 
In a few cases, essentially the same word has a different spelling that reflects a different pronunciation. However, in most cases the pronunciation of the words is the same.
As well as the miscellaneous cases listed in the following table, the past tenses of some irregular verbs differ in both spelling and pronunciation, as with smelt (UK) versus smelled (US) (see American and British English differences: Verb morphology).
|airplane||Aeroplane, originally a French loanword with a different meaning, is the older spelling. The oldest recorded uses of the spelling airplane are British. According to the OED, "[a]irplane became the standard American term (replacing aeroplane) after this was adopted by the National Advisory Committee for Aeronautics in 1916. Although A. Lloyd James recommended its adoption by the BBC in 1928, it has until recently been no more than an occasional form in British English." In the British National Corpus, aeroplane outnumbers airplane by more than 7:1 in the UK. The case is similar for the British aerodrome and American airdrome,Aerodrome is used merely as a technical term in Australia, Canada and New Zealand. The prefixes aero- and air- both mean air, with the first coming from the Ancient Greek word ἀήρ (āēr). Thus, the prefix appears in aeronautics, aerostatics, aerodynamics, aeronautical engineering and so on, while the second occurs invariably in aircraft, airport, airliner, airmail etc. In Canada, airplane is more common than aeroplane, although aeroplane is not unknown, especially in parts of French Canada (where it is, however, used only in English – the French term is avion, and the French word aéroplane designates 19th-century flying machines).|
|aluminium||aluminum||The spelling aluminium is the international standard in the sciences according to the IUPAC recommendations. Humphry Davy, the element's discoverer, first proposed the name alumium, and then later aluminum. The name aluminium was finally adopted to conform with the -ium ending of metallic elements. Canada uses aluminum and Australia and New Zealand aluminium, according to their respective dictionaries.|
|arse||ass||In vulgar senses "buttocks" ("anus"/"wretch"/"idiot"); unrelated sense "donkey" is ass in both. Arse is very rarely used in the US, though often understood.|
|behove||behoove||The 19th century had the spelling behove pronounced to rhyme with move. Subsequently, a pronunciation spelling was adopted in America, while in Britain a spelling pronunciation was adopted.|
|bogeyman||boogeyman or boogerman||It is pronounced // BOH-gee-man in the UK, so that the American form, boogeyman /ˈbʊɡimæn/, is reminiscent of the 1970s disco dancing "boogie" to the British ear. Boogerman /bʊɡɚmæn/ is common in the Southern US and gives an association with the slang term booger for Nasal mucus while the mainstream American spelling of boogeyman does not, but aligns more closely with the British meaning where a bogey is also nasal mucus.|
|brent||brant||For the species of goose.|
|carburettor||carburetor||UK //; US //.|
|charivari||shivaree, charivari||In America, where both terms are mainly regional, charivari is usually pronounced as shivaree, which is also found in Canada and Cornwall, and is a corruption of the French word.|
|coupé||coupe||For a two-door car; the horse-drawn carriage is coupé in both (meaning "cut"); unrelated "cup"/"bowl" is always coupe. In the United States, the "e" is accented when it is used as a foreign word.|
|eyrie||aerie||This noun (not to be confused with the adjective eerie) rhymes with weary and hairy respectively. Both spellings and pronunciations occur in America.|
|fillet||fillet, filet||Meat or fish. Pronounced the French way (approximately) in the US; Canada follows British pronunciation and distinguishes between fillet, especially as concerns fish, and filet, as concerns certain cuts of beef. McDonald's in the UK use the US spelling "filet" for their Filet-O-Fish.|
|furore||furor||Furore is a late 18th-century Italian loan-word that replaced the Latinate form in the UK in the following century, and is usually pronounced with a voiced e. The Canadian usage is the same as the American, and Australia has both.|
|grotty||grody||Clippings of grotesque; both are slang terms from the 1960s.|
|haulier||hauler||Haulage contractor; haulier is the older spelling.|
|jemmy||jimmy||In the sense "crowbar".|
|moustache||mustache||In America, according to the Merriam-Webster Collegiate Dictionary and the The American Heritage Dictionary of the English Language, the British spelling is an also-ran, yet the pronunciation with second-syllable stress is a common variant. In Britain the second syllable is usually stressed.|
|mum(my)||mom(my)||Mother. Mom is sporadically regionally found in the UK (e.g. in West Midlands English). Some British dialects have mam, and this is often used in Northern English, Hiberno-English, and Welsh English. Scottish English may also use mam, ma or maw. In the American region of New England, especially in the case of the Boston accent, the British pronunciation of mum is often retained, while it is still spelled mom. In Canada, there are both mom and mum; Canadians often say mum and write mom. In Australia and New Zealand, mum is used. In the sense of a preserved corpse, mummy is always used.|
|naivety||naïveté||The American spelling is from French, and American speakers generally approximate the French pronunciation as /nɑːiːv(ɨ)ˈteɪ/, whereas the British spelling is nativised, as also the pronunciation /nɑːˈiːv(ɨ)ti/. In the UK, naïveté is a minor variant, used about 20% of the time in the British National Corpus; in America, naivete and naiveté are marginal variants, and naivety is almost unattested.|
|orientated||oriented||In the UK, Australia and New Zealand, it is common to use orientated (as in family-orientated), whereas in the US oriented is used exclusively (family-oriented). Both words have the same origins, coming from "orient" or its off-shoot "orientation".|
|pyjamas||pajamas||The 'y' represents the pronunciation of the original Urdu "pāy-jāma", and in the 18th century spellings such as "paijamahs" and "peijammahs" appeared: this is reflected in the pronunciation // (with the first syllable rhyming with "pie") offered as an alternative in the first edition of the Oxford English Dictionary. Both "pyjamas" and "pajamas" are also known from the 18th century, but the latter became more or less confined to the US. Canada follows both British and American usage, with both forms commonplace.|
|pernickety||persnickety||Persnickety is a late 19th-century American alteration of the Scots word pernickety.|
|quin||quint||Abbreviations of quintuplet.|
|scallywag||scalawag||In the United States (where the word originated, as scalawag), scallywag is not unknown.|
|speciality||specialty||In British English the standard usage is speciality, but specialty occurs in the field of medicine, and also as a legal term for a contract under seal. In Canada, specialty prevails. In Australia and New Zealand both are current.|
|titbit||tidbit||According to the Oxford English Dictionary, the oldest form was "tyd bit", and the alteration to "titbit" was probably under the influence of the obsolete word "tit", meaning a small horse or girl.|
|whilst||while||Penguin Working Words recommends while only, and notes that whilst is old-fashioned. The Cambridge Guide to English Usage and Merriam–Webster's Dictionary of English Usage comment on its regional character, and note that it is rare in American usage. It is thus safer to use only while in international English. (See the article While for further sources deprecating the use of whilst, and cautioning about uses of while.)|
Miscellaneous spelling differences 
In the table below, the main spellings are above the accepted alternative spellings. Note that this list includes words that were historically spelled differently in American/British English but today are usually spelled the same.
|Ake is the older spelling of the verb. It was changed to ache in the 18th century as it was wrongly thought to come from the Greek akhos.|
|The word was spelled aker in Middle English and æcer in Old English.|
|annexe||annex||To annex is the verb in both British and American usage; however, when speaking of an annex(e) – the noun referring to an extension of a main building – the root word is spelled with an -e at the end in the UK and Australia, but in the US and New Zealand it is not.|
|artifact||In British English, artefact is the main spelling and artifact a minor variant. In American English, artifact is the usual spelling. Canadians prefer artifact and Australians artefact, according to their respective dictionaries. Artefact reflects Arte-fact(um), the Latin source.|
|Both the noun and verb. The word comes from Old English æx. In the US, both spellings are acceptable and commonly used. The Oxford English Dictionary states that "the spelling ax is better on every ground, of etymology, phonology, and analogy, than axe, which became prevalent in the 19th century; but it ["ax"] is now disused in Britain".|
|camomile, chamomile||chamomile, camomile||The word derives, via French and Latin, from Greek χαμαίμηλον ("earth apple"). The more common British spelling "camomile", corresponding to the immediate French source, is the older in English, while the spelling "chamomile" more accurately corresponds to the ultimate Latin and Greek source. In the UK, according to the OED, "the spelling cha- is chiefly in pharmacy, after Latin; that with ca- is literary and popular". In the US chamomile dominates in all senses.|
|cheque||check||In banking. Hence pay cheque and paycheck. Accordingly, the North American term for what is known as a current account or cheque account in the UK is spelled chequing account in Canada and checking account in the US. Some American financial institutions, notably American Express, use cheque, but this is merely a trademarking affectation.|
|chequer||checker||As in chequerboard/checkerboard, chequered/checkered flag etc. In Canada as in the US.|
|The original Mexican Spanish word is spelled chile. In Merriam-Webster's Collegiate Dictionary, chile and chilli are given as also variants.|
|Quire was given as an alternative spelling by Webster (1828, 1844 and 1913) and Century Dictionary. However, Quire is also used in the UK to refer to the area in a cathedral occupied by the choir (usually the western part of the chancel).|
|cosy||cozy||In all senses (adjective, noun, verb).|
|doughnut||doughnut, donut||In the US, both are used, with donut indicated as a variant of doughnut. In the UK, donut is indicated as an American variant for doughnut.|
|draught||draft||British English usually uses draft for all senses as the verb; for a preliminary version of a document; for an order of payment (bank draft), and for military conscription (although this last meaning is not as common as in American English). It uses draught for drink from a cask (draught beer); for animals used for pulling heavy loads (draught horse); for a current of air; for a ship's minimum depth of water to float; and for the game draughts, known as checkers in America. It uses either draught or draft for a plan or sketch (but almost always draughtsman in this sense; a draftsman drafts legal documents). American English uses draft in all these cases, including draftsman (male or female) (although in regard to drinks, draught is sometimes found). Canada uses both systems; in Australia, draft is used for technical drawings, is accepted for the "current of air" meaning, and is preferred by professionals in the nautical sense. The pronunciation is always the same for all meanings within a dialect (RP /ˈdrɑːft/, General American /ˈdræft/). The spelling draught is older; draft appeared first in the late 16th century.|
|Both spellings have existed since Middle English.|
|gauntlet||gauntlet, gantlet||When meaning "ordeal", in the phrase running the ga(u)ntlet, some American style guides prefer gantlet. This spelling is unused in Britain and less usual in America than gauntlet. The word is an alteration of earlier gantlope by folk etymology with gauntlet ("armored glove"), always spelled thus.|
|The word comes from French gazelle, which was spelled gazel in Old French.|
|glycerine||glycerin, glycerine||Scientists use the term glycerol, but both spellings are used sporadically in the US.|
|grey||gray||Grey became the established British spelling in the 20th century, pace Dr Johnson and others, and it is but a minor variant in American English, according to dictionaries. Canadians tend to prefer grey. The non-cognate greyhound was never grayhound. Both Grey and Gray are found in proper names everywhere in the English-speaking world. The two spellings are of equal antiquity, and the Oxford English Dictionary states that "each of the current spellings has some analogical support".|
|In the US, "grille" refers to that of an automobile, whereas "grill" refers to a device used for heating food. However, it is not uncommon to see both spellings used in the automotive sense, as well as in Australia, and New Zealand.|
|hearken||harken||The word comes from hark. The spelling hearken was likely influenced by hear.|
|Idyl was the spelling of the word preferred in the US by the Merriam-Webster dictionary, for the same reason as the double consonant rule; idyll, the original form from Greek eidullion, is now generally used in both the UK and US.|
|jail||In the UK, gaol and gaoler are used sometimes, apart from literary usage, chiefly to describe a medieval building and guard. Both spellings go back to Middle English: gaol was a loanword from Norman French, while jail was a loanword from central (Parisian) French. In Middle English the two spellings were associated with different pronunciations. In current English the word, however spelled, is always given the pronunciation originally associated only with the jail spelling (//). The survival of the gaol spelling in British English is "due to statutory and official tradition".|
|kerb||curb||For the noun designating the edge of a roadway (or the edge of a British pavement/ American sidewalk/ Australian footpath). Curb is the older spelling, and in the UK and US it is still the proper spelling for the verb meaning restrain.|
|(kilo)gram||(Kilo)gramme is used sometimes in the UK but never in the US. (Kilo)gram is the only spelling used by the International Bureau of Weights and Measures.|
|liquorice||licorice||The American spelling is nearer the Old French source licorece, which is ultimately from Greek glykyrrhiza. The British spelling was influenced by the unrelated word liquor. Licorice prevails in Canada and it is common in Australia, but it is rarely found in the UK. Liquorice is all but nonexistent in the US ("Chiefly British", according to dictionaries).|
|mollusc||mollusk, mollusc||The related adjective may be spelled molluscan or molluskan.|
|mould||mold||In all senses of the word. The American spelling is the older of the two. In Canada, both words have wide currency. When speaking of the noun describing a form for casting a shape, the US will also use the "mould" spelling, but defaults to "mold" when referring to the fruiting bodies of tiny fungi.|
|The omelet spelling is the older of the two, in spite of the etymology (French omelette). Omelette prevails in Canada and in Australia.|
|The opake spelling is the older of the two. The word began to be respelled in the 17th century to match the French spelling. Nevertheless, the older spelling lingered and appeared in Webster's dictionaries.|
|The word was originally spelled in English with an f but began to be respelled in the 16th century. It is related to the words fantasy and fantastic, which were for a time spelled phantasie and phantastique.|
|The fantom spelling is the older of the two and has existed since Middle English. It is related to the words phantasm/fantasm, fantasy and fantastic.|
|phoney||phony||The American spelling is the older of the two. The word originated in America and made its widespread appearance in Britain during the Phoney War. Phony is famously used often in The Catcher in the Rye.|
|plough||plow||Both spellings have existed since Middle English. The OED records several dozen variants. In the UK, plough has been the standard spelling for about 300 years. Although plow was Noah Webster's pick, plough continued to have some currency in the US, as the entry in Webster's Third (1961) implies. Newer dictionaries label plough as "chiefly British". The word snowplough/snowplow, originally an Americanism, predates Webster's dictionaries and was first recorded as snow plough. Canada has both plough and plow, although snowplough is much rarer there than snowplow. In the US, "plough" sometimes describes a horsedrawn kind while "plow" refers to a gasoline (petrol) powered kind. The American spelling appears to relate to the Latin "plovum".|
|primaeval||primeval||Primeval is also common in UK but etymologically 'ae' is nearer the Latin source primus first + aevum age.|
|rack and ruin||wrack and ruin||Several words like "rack" and "wrack" have been conflated, with both spellings thus accepted as variants for senses connected to torture (orig. rack) and ruin (orig. wrack, cf. wreck) In "(w)rack and ruin", the W-less variant is now prevalent in the UK but not the US. The term, however, is rare in the US.|
|The word comes from French redoute. The b was added by influence of the unrelated word doubt.|
|In the context of sound and music, the word was spelled rime or ryme in Middle English. The term 'rime ice' is unrelated and is spelled the same everywhere.|
|sceptic (-al, -ism)||skeptic (-al, -ism)||The American spelling, akin to Greek, is the earliest known spelling in English. It was preferred by Fowler, and is used by many Canadians, where it is the earlier form. Sceptic also pre-dates the European settlement of the US, and it follows the French sceptique and Latin scepticus. In the mid-18th century, Dr Johnson's dictionary listed skeptic without comment or alternative, but this form has never been popular in the UK; sceptic, an equal variant in the old Webster's Third (1961), has now become "chiefly British". Australians generally follow the British usage (with the notable exception of the Australian Skeptics). All of these versions are pronounced with a hard "c", though in French that letter is silent and the word is pronounced like septique.|
|The word comes from Old English siðe . Some writers began to use the sc- spelling in the 15th century as they wrongly thought it was related to the Latin scindere (meaning "to cut").|
|slew, slue||slue, slew||Meaning "to turn sharply; a sharp turn", the preferred spelling differs. Meaning "a great number" is usually slew in all regions.|
|smoulder||smolder||The American spelling is the older of the two and has existed since Middle English.|
|storey||story||Level of a building. The plurals are storeys and stories respectively. The letter "e" is used in the UK and Canada to differentiate between levels of buildings and a story as in a literary work. Story is the earlier spelling. The Oxford English Dictionary states that this word is "probably the same word as story [in its meaning of "narrative"] though the development of sense is obscure.|
|Sulfur is the preferred spelling by the International Union of Pure and Applied Chemistry (IUPAC) and by the UK's Royal Society of Chemistry (RSC). Sulphur is used by British and Irish scientists, and it is actively taught in British and Irish schools. It prevails in Canada and Australia, and it is also found in some American place names (e.g. Sulphur, Louisiana and White Sulphur Springs, West Virginia). American English usage guides suggest sulfur for technical usage, and both sulfur and sulphur in common usage and in literature. The variation between f and ph spellings is also found in the word's ultimate source: Latin sulfur, sulphur.|
|"Thru" is typically used in the US as shorthand.|
|tyre||tire||The outer portion of a wheel. In Canada as in the US. Tire is the older spelling, but both were used in the 15th and 16th centuries (for a metal tire). Tire became the settled spelling in the 17th century but tyre was revived in the UK in the 19th century for rubber / pneumatic tyres, possibly because it was used in some patent documents, though many continued to use tire for the iron variety. The Times newspaper was still using tire as late as 1905. For the verb meaning "to grow weary" both American and British English use only the tire spelling.|
|vice||vise, vice||The two-jawed workbench tool. Americans and Canadians retain the very old distinction between vise (the tool) and vice (the sin, and also the Latin prefix meaning a "deputy"), both of which are vice in the UK and Australia. Thus, Americans have Vice-Admiral, Vice-President, and Vice-Principal, but never Vise- for any one of these.|
|The word comes from Old French villain, which comes from Medieval Latin villanus.|
|Yoghurt is an also-ran in the US, as is yoghourt in the UK. Although the Oxford Dictionaries have always preferred yogurt, in current British usage yoghurt seems to be prevalent. In Canada, yogurt prevails, despite the Canadian Oxford preferring yogourt, which has the advantage of being bilingual (English and French). Australian usage tends to follow the UK. Whatever the spelling is, the word has different pronunciations: in the UK /ˈjɒɡɚt/ or /ˈjoʊɡɚt/, only /ˈjoʊɡɚrt/ in America, Ireland, and Australia. The word comes from the Turkish language word yoğurt. The voiced velar fricative represented by ğ in the modern Turkish (Latinic) alphabet was traditionally written gh in romanizations of the Ottoman Turkish (Arabic) alphabet used before 1928.|
Compounds and hyphens 
British English often prefers hyphenated compounds, such as counter-attack, whereas American English discourages the use of hyphens in compounds where there is no compelling reason, so counterattack is much more common. Many dictionaries do not point out such differences. Canadian and Australian usage is mixed, although Commonwealth writers generally hyphenate compounds of the form noun plus phrase (such as editor-in-chief). Commander-in-chief prevails in all forms of English.
- any more or anymore: In sense "any longer", the single-word form is usual in North America and Australia but unusual elsewhere, at least in formal writing. Other senses always have the two-word form; thus Americans distinguish "I couldn't love you anymore [so I left you]" from "I couldn't love you any more [than I already do]". In Hong Kong English, any more is always two words.
- for ever or forever: Traditional British English usage makes a distinction between for ever, meaning for eternity (or a very long time into the future), as in "If you are waiting for income tax to be abolished you will probably have to wait for ever"; and forever, meaning continually, always, as in "They are forever arguing". In British usage today, however, forever prevails in the "for eternity" sense as well, in spite of several style guides maintaining the distinction. American writers usually use forever regardless of which sense they intend (although forever in the sense of "continually" is comparatively rare in American English, having been displaced by always).
- near by or nearby: Some British writers make the distinction between the adverbial near by, which is written as two words, as in, "No one was near by"; and the adjectival nearby, which is written as one, as in, "The nearby house". In American English, the one-word spelling is standard for both forms.
Acronyms and abbreviations 
Acronyms pronounced as words are often written in title case by Commonwealth writers, but usually as upper case by Americans: for example, Nasa / NASA or Unicef / UNICEF. This does not apply to abbreviations that are pronounced as individual letters (referred to by some as "initialisms"), such as US, IBM, or PRC (the People's Republic of China), which are always written as upper case. However, sometimes title case is still used in the UK, such as Pc (Police Constable).
Contractions, where the final letter is present, are often written in British English without full stops/periods (Mr, Mrs, Dr, St, Ave). Abbreviations where the final letter is not present generally do take full stops/periods (such as vol., etc., i.e., ed.); British English shares this convention with the French: Mlle, Mme, Dr, Ste, but M. for Monsieur. In American and Canadian English, abbreviations like St., Ave., Mr., Mrs., Ms., Dr., and Jr., always require periods. Some initials are usually upper case in the US but lower case in the UK: liter/litre and its compounds ("2 L or 25 mL" vs "2 l or 25 ml"); and ante meridiem and post meridiem (10 P.M. or 10 PM vs 10 p.m. or 10 pm). Both AM/PM and a.m./p.m. are acceptable in American English, though AM/PM is more common.
The use of quotation marks, also called inverted commas or speech marks, is complicated by the fact that there are two kinds: single quotation marks (') and double quotation marks ("). As a general rule, British usage has in the past usually preferred single quotation marks for ordinary use, but double quotation marks are now increasingly common; American usage has always preferred double quotation marks, as does Canadian, Australian, and New Zealand English.
The convention used to be, and in American English still is, to put full stops (periods) and commas inside the quotation marks, irrespective of the sense. British English has moved away from this style while American English has kept it. British style now prefers to punctuate according to the sense, in which punctuation marks only appear inside quotation marks if they were there in the original. Moreover, formal British English practice requires a full stop to be put inside the quotation marks if the quoted item is a full sentence that ends where the main sentence ends, but it is common to see the stop outside the ending quotation marks.
See also 
- Australian English
- Canadian English
- England English
- English in the Commonwealth of Nations
- English orthography
- Indian English
- Malaysian English
- New Zealand English
- Philippine English
- Scottish English
- South African English
- Scragg, Donald (1974). A history of English spelling. Manchester, England: Manchester University Press. pp. 82–83. ISBN 978-0-06-496138-7. "Johnson's dictionary became the accepted standard for private spelling...of a literate Englishman...during the nineteenth century...Webster had more success in influencing the development of American usage than Johnson had with British usage."
- Clark, 2009.
- Chambers, 1998.
- The Macquarie Dictionary, Fourth Edition. The Macquarie Library Pty Ltd, 2005.
- Webster's Third, p. 24a.
- Oxford English Dictionary, colour, color.
- Onions, CT, ed. (1987) . The Shorter Oxford English Dictionary (Third Edition (1933) with corrections (1975) ed.). Oxford: Oxford University Press. p. 370. ISBN 0-19-861126-9.
- Peters, p. 397.
- Johnson 1755—preface
- Mencken, H L (1919). The American Language. New York: Knopf. ISBN 0-394-40076-3.
- Staff. "The Proceedings of the Old Bailey, 1674–1913". Humanities Research Institute, University of Sheffield. Archived from the original on 23 July 2008. Retrieved 19 June 2008.
- Oxford English Dictionary, honour, honor.
- Baldrige, Letitia (1990). Letitia Baldrige's Complete Guide to the New Manners for the '90s: A Complete Guide to Etiquette. Rawson. p. 214. ISBN 0-89256-320-6.
- MacPherson, William (31 March 1990). "Practical concerns spelled the end for -our". Ottawa Citizen. p. B3.
- "Australian Labor: History". ALP.org.au.
- Venezky, Richard L. (2001). "-re versus -er". In Algeo, John. The Cambridge History of the English Language. VI: English in North America. Cambridge, England: Cambridge University Press. p. 353. ISBN 0-521-26479-0.
- Howard, Philip (1984). The State of the Language—English Observed. London: Hamish Hamilton. p. 148. ISBN 0-241-11346-6.
- From the OED cites, Chaucer used both forms, but the last usages of the "re" form were in the early 18th century. The Oxford English Dictionary: 1989 edition.
- Except in a 1579 usage (Oxford English Dictionary: 1989 edition).
- Although acre was spelled æcer in Old English and aker in Middle English, the acre spelling of Middle French was introduced in the 15th century. Similarly, loover was respelled in the 17th century by influence of the unrelated Louvre. (See OED, s.v. acre and louvre)
- Gove, Philip, ed. (1989). "-er/-re". Webster's third new international dictionary of the English language 2 (3 ed.). Springfield, MA: Merriam Webster. pp. 24a. ISBN 978-0-87779-302-1.
- Robin Pogrebin (3 September 2003). "Proposing an American Theater Downtown". The New York Times (The New York Times Company). Retrieved 22 September 2008. Unknown parameter
- "The American National Theatre (ANT)". ANT. 2008–2009. Archived from the original on 7 September 2008. Retrieved 22 September 2008.
- "The Kennedy Center". John F. Kennedy Center for the Performing Arts. Archived from the original on 23 September 2008. Retrieved 22 September 2008.
- "Cinemark Theatres". Centurytheaters.com. Retrieved 7 February 2010.
- "accoutre". Merriam-webster.com. Retrieved 2012-03-04.
- Peters, p 461.
- Style Manual for Authors, Editors and Printers of Australian Government Publications, Third Edition, Revised by John Pitson, Australian Government Publishing Service, Canberra, 1978, page 10, "In general, follow the spellings given in the latest edition of the Concise Oxford Dictionary.
- Peters (2004: 135)
- 1989 Oxford English Dictionary:connexion, connection.
- The American Heritage Dictionary of the English Language:complection. New York: Houghton Mifflin. 2000. Retrieved 12 May 2007
- "complected". Merriam-Webster's Dictionary of English usage. Springfield, Mass: Merriam-Webster, Inc. 1994. p. 271. ISBN 0-87779-132-5. "not an error...simply an Americanism"
- "complect, v.". Oxford English Dictionary.
- "Are spellings like 'privatize' and 'organize' Americanisms?". AskOxford.com. 2006.
- Peters, p. 298: "[With] contemporary British writers the ise spellings outnumber those with ize in the ratio of about 3:2" (emphasis as original)
- Oxford English Dictionary "-ise1"
- Oxford English Dictionary, -ize.
- Hargraves, p. 22.
- Hart, Horace. Hart's Rules for Compositors and Readers at the University Press, Oxford (39 ed.). Oxford, England: Oxford University Press. ISBN 0-19-212983-X.
- Allen, Robert, ed. (2008). Pocket Fowler's Modern English Usage. Oxford, England: Oxford University Press. p. 354. ISBN 978-0-19-923258-1. "may be legitimately spelled with either -ize or -ise throughout the English-speaking world (except in America, where -ize is always used)...Cambridge University Press and others prefer -ise"
- "prize". Webster's Third New International Dictionary, Unabridged. Merriam-Webster, 2002. Also, "prize". Merriam-Webster's Collegiate Dictionary, Eleventh Ed.
- According to Merriam-Webster's Collegiate Dictionary, Eleventh Ed.: prise is a "chiefly Brit var of PRIZE".
- Peters, p. 441
- Peters, p. 446.
- Oxford English Dictionary, analyse, -ze, v. .
- Both the Merriam-Webster's Collegiate Dictionary and The American Heritage Dictionary of the English Language have "catalog" as the main headword and "catalogue" as an equal variant.
- Peters, p. 236.
- "MSDN C#.NET OpenFileDialog Class". Msdn.microsoft.com. Retrieved 2012-03-04.
- Peters, p. 36.
- Hutchinson Pocket Factfinder. Helicon. p. 98.
- Peters, p. 20.
- Webster's Third New International Dictionary, copyright 1993 by Merriam-Webster, Inc.
- Aronson, Jeff (26 July 1997). "When I use a word...:Oe no!". British Medical Journal 315 (7102).[dead link]
- New Oxford Dictionary of English.
- The Economist Style Guide, copyright 2005 by The Economist Newspaper Ltd
- Webster's Third, p. 23a.
- Wilson, Kenneth G. (1993). "subpoena, subpena (n., v.)". The Columbia Guide to Standard American English. New York: Columbia University Press. ISBN 0-231-06989-8. Archived from the original on 9 November 2007. Retrieved 8 November 2007.
- Merriam-Webster Collegiate Dictionary, airplane.
- Peters, p. 20, p. 389.
- Peters, p. 338.
- Peters, p. 309.
- Cf. Oxford English Dictionary, traveller, traveler.
- Peters, p. 581
- Zorn, Eric (8 June 1997). "Errant Spelling: Moves for simplification turn Inglish into another langwaj". Chicago Tribune. pp. Section 3A page 14. Retrieved 17 March 2007.
- Cambridge Advanced Learner's Dictionary, jewellery UK, American jewelry
- Peters, p. 283
- "fulfil". Collins English Dictionary. Retrieved May 3, 2013.
- "fulfil". Oxford English Dictionary (3rd ed.). Oxford University Press. September 2005.
- Peters, p. 501.
- Peters, p. 22.
- Peters, p. 480. Also National Routeing Guide
- In American English, swingeing is sometimes spelled swinging see American Heritage Dictionary entry, and the reader has to discern from the context which word and pronunciation is meant.
- British National Corpus
- Peters, p. 7
- Peters, p. 303.
- "Spelling, Abbreviations and Symbols Guide" (pdf). Retrieved 2012-11-15.
- "BBC Mundo | Questions about English". Bbc.co.uk. Retrieved 2012-03-04.
- Merriam-Webster Online. . Retrieved 30 December 2007.
- Howarth, Lynne C; and others (14 June 1999). ""Executive summary" from review of "International Standard Bibliographic Description for Electronic Resources"". American Library Association. Archived from the original on 16 April 2007. Retrieved 30 April 2007.
- Peters, p. 282.
- "Chambers | Free English Dictionary". Chambersharrap.co.uk. Retrieved 7 February 2010.
- Peters, p. 285
- Merriam-Webster Online. . Retrieved 30 December 2007.
- Peters, 51 "assurance or insurance"
- "Canada Life homepage". The Canada Life Assurance Company 2008 - 2011. 2011. Retrieved 2011-12-17.
- "Great-West Life homepage". The Great-West Life Assurance Company. 2011. Retrieved 2011-12-17.
- Peters, p. 340.
- Peters, p. 443.
- Bureau International des Poids et Mesures, 2006, p. 124.
- The Metric Conversion Act of 1985 gives the Secretary of Commerce of the US the responsibility of interpreting or modifying the SI for use in the US. The Secretary of Commerce delegated this authority to the Director of the National Institute of Standards and Technology (NIST) (Turner, 2008). In 2008, the NIST published the US version (Taylor and Thompson, 2008a) of the English text of the eighth edition of the International Bureau of Weights and Measures publication Le Système International d'Unités (SI) (BIPM, 2006). In the NIST publication, the spellings "meter", "liter", and "deka" are used rather than "metre", "litre", and "deca" as in the original BIPM English text (Taylor and Thompson, 2008a, p. iii). The Director of the NIST officially acknowledged this publication, together with Taylor and Thompson (2008b), as the "legal interpretation" of the SI for the United States (Turner, 2008).
- "etymonline.com". etymonline.com. Retrieved 2012-03-04.
- Oxford English Dictionary, airplane, draft revision March 2008; airplane is labelled "chiefly North American"
- British National Corpus. Retrieved 1 April 2008.
- Merriam-Webster online, aerodrome. Retrieved 1 April 2008.
- Oxford English Dictionary, airdrome.
- "merriam-webster.com". merriam-webster.com. Retrieved 2012-03-04.
- "History & Etymology of Aluminium". Elements.vanderkrogt.net. 2002-10-01. Retrieved 2012-03-04.
- Peters, p. 32.
- Murray, James A. H. (1880). Spelling Reform. Annual address of the President of the Philological Society. Bath: Isaac Pitman. p. 5. Retrieved 3 May 2010.
- The American Heritage Dictionary of the English Language: Fourth Edition. 
- OED, shivaree
- Oxford English Dictionary, furore.
- Peters, p. 221.
- Oxford English Dictionary, Grotty; Grody
- Peters, p. 242
- Oxford English Dictionary, mom and mam
- Added by Symphony on 15 October 2009 (15 October 2009). "Things I don't Understand: Part 3 – Canada!". giantbomb. Retrieved 7 February 2010.[dead link]
- Peters, p. 364.
- Merriam Webster's 11th Collegiate Dictionary, naïveté and naivety.
- "Grammar - Oxford Dictionaries Online". Askoxford.com. Retrieved 2012-03-04.
- OED, s.v. 'pyjamas'
- Oxford English Dictionary, persnickety
- Peters, p. 487
- In Webster's New World College Dictionary, scalawag is lemmatized without alternative, while scallawag and scallywag are defined by cross-reference to it. All of them are marked as "originally American".
- See, for example, the November 2006 BMA document titled Selection for Specialty Training
- Peters, p. 510.
- "Search => [word] => ake :: 1828 Dictionary :: Search the 1828 Noah Webster's Dictionary of the English Language (FREE)". 1828.mshaffer.com. 2009-10-16. Retrieved 2012-03-04.
- "Search => [word] => ake :: 1913 Dictionary :: Search the 1913 Noah Webster's Dictionary of the English Language (FREE)". 1913.mshaffer.com. 2009-10-16. Retrieved 2012-03-04.
- The Century Dictionary Online
- Online Etymology Dictionary: ache
- "Browse 1828 => Word AKER :: Search the 1828 Noah Webster's Dictionary of the English Language (FREE)". 1828.mshaffer.com. 2009-10-16. Retrieved 2012-03-04.
- Dictionary.com: acre
- "Annexes". Australiawide Annexes. Retrieved 2012-11-13.
- "Tui Eco Annex | Accommodation in Northland, New Zealand". Newzealand.com. Retrieved 2012-11-13.
- Oxford English Dictionary, artefact.
- Peters, p. 49.
- Oxford English Dictionary. Oxford, England: Oxford University Press. March 2009.
- Oxford English Dictionary online edition: entry "axe | ax"
- "Browse 1828 => Word BRAZIER :: Search the 1828 Noah Webster's Dictionary of the English Language (FREE)". 1828.mshaffer.com. 2009-10-16. Retrieved 2012-03-04.
- "Browse 1913 => Word BRAZIER :: Search the 1913 Noah Webster's Dictionary of the English Language (FREE)". 1913.mshaffer.com. 2009-10-16. Retrieved 2012-03-04.
- Oxford English Dictionary, online edition, entry "camomile | chamomile"
- Peters, p. 104.
- Oxford Advanced Learner's Dictionary. Retrieved 2009-4-19.
- For example, York Minster's Quire - http://www.britainexpress.com/cities/york/York_Minster_Quire.htm (a virtual tour of the Quire of York Minster on the Britain Express website) and the Quire at Bristol Cathedral - http://www.bristol-cathedral.co.uk/index.php?id=53 (on the Bristol Cathedral website).
- "Browse 1828 => Word CORVET :: Search the 1828 Noah Webster's Dictionary of the English Language". 1828.mshaffer.com. 2012-06-03. Retrieved 2012-06-03.
- "Browse 1913 => Word CORVET :: Search the 1828 Noah Webster's Dictionary of the English Language". 1828.mshaffer.com. 2012-06-03. Retrieved 2012-06-03.
- "Browse 1828 => Word DOMICIL :: Search the 1828 Noah Webster's Dictionary of the English Language (FREE)". 1828.mshaffer.com. 2009-10-16. Retrieved 2012-03-04.
- Definition for DOMICIL - Webster’s 1844 dictionary. Emily Dickinson Lexicon. Brigham Young University.
- Merriam-Webster Online. . Retrieved 1 January 2008.
- Cambridge Advanced Learner's Dictionary. . Retrieved 1 January 2008.
- "draught". Concise OED. Retrieved 1 April 2007.
- Peters, p. 165.
- Oxford English Dictionary, draught.
- "Online Etymology Dictionary: gage". Etymonline.com. Retrieved 2012-03-04.
- Garner, Bryan A. (1998). A Dictionary of Modern American Usage. New York: OUP. p. 313. ISBN 0-19-507853-5.
- "gauntlet2". Concise OED.
- "Browse 1913 => Word GAZEL :: Search the 1913 Noah Webster's Dictionary of the English Language (FREE)". 1913.mshaffer.com. 2009-10-16. Retrieved 2012-03-04.
- "Browse 1828 => Word GAZEL :: Search the 1828 Noah Webster's Dictionary of the English Language (FREE)". 1828.mshaffer.com. 2009-10-16. Retrieved 2012-03-04.
- Online Etymology Dictionary: gazelle
- Peters, p. 235
- Oxford English Dictionary, online edition: entry "grey | gray"
- customcargrills.com. "Custom Car & Truck Grills - Billet & Mesh Grill Inserts". customcargrills.com. Retrieved 2012-11-13.
- Williams, Brian (2011-06-03). "Kookaburra survives 700km trip after being stuck in car's grille | thetelegraph.com.au". Dailytelegraph.com.au. Retrieved 2012-11-13.
- "Cat survives 35km wedged in car grille - National - NZ Herald News". Nzherald.co.nz. 2012-06-11. Retrieved 2012-11-13.
- Online Etymology Dictionary: hearken
- Oxford English Dictionary, online edition: entry "jail | gaol"
- tiscali.reference. Retrieved on 10 March 2007.
- "Online Etymology Dictionary: licorice". Etymonline.com. Retrieved 2012-03-04.
- Ernout, Alfred; Meillet, Antoine (2001). Dictionnaire etymologique de la langue latine. Paris: Klincksieck. p. 362. ISBN 2-252-03359-2.
- Peters, p. 321.
- Definition for MIDRIF - Webster’s 1844 dictionary. Emily Dickinson Lexicon. Brigham Young University.
- "Browse 1828 => Word MOSK :: Search the 1828 Noah Webster's Dictionary of the English Language". 1828.mshaffer.com. 2012-06-03. Retrieved 2012-06-03.
- "Browse 1913 => Word MOSK :: Search the 1913 Noah Webster's Dictionary of the English Language". 1913.mshaffer.com. 2012-06-03. Retrieved 2012-06-03.
- Oxford English Dictionary, online edition: entry "mould | mold"
- Peters, p. 360
- Peters, p. 392.
- Online Etymology Dictionary: opaque
- "Search => [word] => opake :: 1828 Dictionary :: Search the 1828 Noah Webster's Dictionary of the English Language (FREE)". 1828.mshaffer.com. 2009-10-16. Retrieved 2012-03-04.
- "Search => [word] => opake :: 1913 Dictionary :: Search the 1913 Noah Webster's Dictionary of the English Language (FREE)". 1913.mshaffer.com. 2009-10-16. Retrieved 2012-03-04.
- "Browse 1828 => Word FANTASM :: Search the 1828 Noah Webster's Dictionary of the English Language (FREE)". 1828.mshaffer.com. 2009-10-16. Retrieved 2012-03-04.
- "Browse 1913 => Word FANTASM :: Search the 1913 Noah Webster's Dictionary of the English Language (FREE)". 1913.mshaffer.com. 2009-10-16. Retrieved 2012-03-04.
- Online Etymology Dictionary: phantasm
- "Browse 1828 => Word FANTOM :: Search the 1828 Noah Webster's Dictionary of the English Language (FREE)". 1828.mshaffer.com. 2009-10-16. Retrieved 2012-03-04.
- "Browse 1913 => Word FANTOM :: Search the 1913 Noah Webster's Dictionary of the English Language (FREE)". 1913.mshaffer.com. 2009-10-16. Retrieved 2012-03-04.
- "''A Concise Dictionary of Middle English''". Pbm.com. Retrieved 2012-03-04.
- "Online Etymology Dictionary: phantom". Etymonline.com. Retrieved 2012-03-04.
- Oxford English Dictionary, phoney, phony
- Oxford English Dictionary, plough, plow.
- Peters, p. 230.
- COED 11th Ed
- "Maven's word of the day: rack/wrack". Randomhouse.com. 1998-04-20. Retrieved 2012-03-04.
- "Cald Rack". Dictionary.cambridge.org. Retrieved 2012-03-04.
- "Browse 1828 => Word REDOUT :: Search the 1828 Noah Webster's Dictionary of the English Language". 1828.mshaffer.com. 2012-06-03. Retrieved 2012-06-03.
- Definition for REDOUT - Webster’s 1844 dictionary. Emily Dickinson Lexicon. Brigham Young University.
- Online Etymology Dictionary: redoubt
- "Browse 1913 => Word RIME :: Search the 1913 Noah Webster's Dictionary of the English Language (FREE)". 1913.mshaffer.com. 2009-10-16. Retrieved 2012-03-04.
- "Browse 1828 => Word RIME :: Search the 1828 Noah Webster's Dictionary of the English Language (FREE)". 1828.mshaffer.com. 2009-10-16. Retrieved 2012-03-04.
- Oxford English Dictionary, online edition: entry "sceptic | skeptic"
- Peters, p. 502.
- Oxford English Dictionary, sceptic, skeptic.
- "Browse 1828 => Word SITHE :: Search the 1828 Noah Webster's Dictionary of the English Language". 1828.mshaffer.com. 2012-06-03. Retrieved 2012-06-03.
- "Browse 1913 => Word SITHE :: Search the 1913 Noah Webster's Dictionary of the English Language". 1913.mshaffer.com. 2012-06-03. Retrieved 2012-06-03.
- Online Etymology Dictionary: scythe
- Berube, Margery S.; Pickett, Joseph P.; Leonesio, Christopher (2005-09-28). "slew / slough / slue". A Guide to Contemporary Usage & Style. Houghton Mifflin Harcourt. p. 435. ISBN 9780618604999. Retrieved 8 November 2012.
- "Search => [word] => sted :: 1828 Dictionary :: Search the 1828 Noah Webster's Dictionary of the English Language (FREE)". 1828.mshaffer.com. 2009-10-16. Retrieved 2012-03-04.
- "Browse 1913 => Word STED :: Search the 1913 Noah Webster's Dictionary of the English Language (FREE)". 1913.mshaffer.com. 2009-10-16. Retrieved 2012-03-04.
- Peters, Pam (2002). "storey or story". The Cambridge Guide to English Usage. Cambridge, England: Cambridge University Press. p. 517. ISBN 0-521-62181-X.
- Oxford English Dictionary, online edition: entry "story | storey"
- "Royal Society of Chemistry 1992 policy change". Rsc.org. 1992-01-01. Retrieved 2012-03-04.
- "The spelling sulfur predominates in United States technical usage, while both sulfur and sulphur are common in general usage. British usage tends to favor sulphur for all applications. The same pattern is seen in most of the words derived from sulfur." Usage note, Merriam-Webster Online. . Retrieved 1 January 2008.
- The contrasting spellings of the chemical elements Al and S mean that the American spelling aluminum sulfide becomes aluminum sulphide in Canada, and as aluminium sulphide in older British usage.
- Oxford English Dictionary, online edition: entry "sulphur | sulfur"
- "Browse 1828 => Word SIRUP :: Search the 1828 Noah Webster's Dictionary of the English Language". 1828.mshaffer.com. 2012-06-03. Retrieved 2012-06-03.
- "Browse 1913 => Word SIRUP :: Search the 1913 Noah Webster's Dictionary of the English Language". 1913.mshaffer.com. 2012-06-03. Retrieved 2012-06-03.
- "Browse 1913 => Word THRU :: Search the 1913 Noah Webster's Dictionary of the English Language (FREE)". 1913.mshaffer.com. 2009-10-16. Retrieved 2012-03-04.
- "Browse 1913 => Word THRUOUT :: Search the 1913 Noah Webster's Dictionary of the English Language (FREE)". 1913.mshaffer.com. 2009-10-16. Retrieved 2012-03-04.
- Peters, p. 553.
- Peters, p. 566.
- "Browse 1828 => Word VILLAN :: Search the 1828 Noah Webster's Dictionary of the English Language". 1828.mshaffer.com. 2012-06-03. Retrieved 2012-06-03.
- "Browse 1913 => Word VILLAN :: Search the 1913 Noah Webster's Dictionary of the English Language". 1913.mshaffer.com. 2012-06-03. Retrieved 2012-06-03.
- Online Etymology Dictionary: villain
- "Browse 1828 => Word VINYARD :: Search the 1828 Noah Webster's Dictionary of the English Language (FREE)". 1828.mshaffer.com. 2009-10-16. Retrieved 2012-03-04.
- "Browse 1913 => Word VIZOR :: Search the 1913 Noah Webster's Dictionary of the English Language (FREE)". 1913.mshaffer.com. 2009-10-16. Retrieved 2012-03-04.
- "Browse 1828 => Word WOFUL :: Search the 1828 Noah Webster's Dictionary of the English Language (FREE)". 1828.mshaffer.com. 2009-10-16. Retrieved 2012-03-04.
- Peters, p. 587. Yogourt is an accepted variant in French of the more normal Standard French yaourt.
- "Merriam-Webster Online – Yogurt entry". Mw1.merriam-webster.com. Retrieved 2012-03-04.
- Peters, p. 258
- Peters, p. 41.
- Bunton, David. Common Englsh Errors in Hong Kong. Hong Kong: Longman. p. 6. ISBN 0-582-99914-6.
- Oxford English Dictionary, for ever.
- AskOxford: forever. Retrieved 24 June 2008. Cf. Peters, p. 214.
- For example, The Times, The Guardian, The Economist. Retrieved 24 June 2008.
- The Columbia Guide to Standard American English
- Marsh, David (14 July 2004). The Guardian Stylebook. Atlantic Books. ISBN 1-84354-991-3. Archived from the original on 20 April 2007. Retrieved 9 April 2007. "acronyms: take initial cap: Aids, Isa, Mori, Nato"
- See for example "Pc bitten on face in Tube attack". BBC. 31 March 2007. Retrieved 9 April 2007.
- "Units outside the SI". Essentials of the SI. NIST. Archived from the original on 31 October 2009. Retrieved 22 October 2009. "although both l and L are internationally accepted symbols for the liter, to avoid this risk the preferred symbol for use in the United States is L"
- "Core learning in mathematics: Year 4". Review of the 1999 Framework. DCSF. 2006. p. 4. Retrieved 22 October 2009. "Use, read and write standard metric units (km, m, cm, mm, kg, g, l, ml), including their abbreviations"
- "PM". Merriam-Webster Online Dictionary. Merriam-Webster. 2009. Retrieved 21 October 2009.
- "P.M.". The American Heritage Dictionary of the English Language (4th ed.). Houghton Mifflin. 2000.
- "What is the correct or more usual written form when writing the time – a.m., am, or A.M.?". AskOxford. Oxford University Press. Retrieved 21 October 2009.
- Trask, Larry (1997). "Quotation Marks and Direct Quotations". Guide to Punctuation. University of Sussex. Archived from the original on 15 December 2010. Retrieved 9 December 2010.
- Quinion, Michael (2010). "Punctuation and Quotation Marks". World Wide Words. Archived from the original on 2 December 2010. Retrieved 9 December 2010.
- Chambers, J.K. (1998). "Canadian English: 250 Years in the Making", in The Canadian Oxford Dictionary, 2nd ed., p xi.
- Clark, Joe (2009). Organizing Our Marvellous Neighbours: How to Feel Good About Canadian English (e-book, version 1.1). ISBN 978-0-9809525-0-6.
- Fowler, Henry; Winchester, Simon (introduction) (2003 reprint). A Dictionary of Modern English Usage (Oxford Language Classics Series). Oxford Press. ISBN 0-19-860506-4.
- Hargraves, Orin (2003). Mighty Fine Words and Smashing Expressions. Oxford: Oxford University Press. ISBN 0-19-515704-4
- Mencken, H. L. (1921). "Chapter 8. American Spelling > 1. The Two Orthographies". The American language: An inquiry into the development of English in the United States, (2nd ed., rev. and enl. ed.). New York: A.A. Knopf. ISBN 1-58734-087-9
- Nicholson, Margaret; (1957). "A Dictionary of American-English Usage Based on Fowler's Modern English Usage". Signet, by arrangement with Oxford University Press.
- Oxford English Dictionary, 20 vols. (1989) Oxford University Press.
- Peters, Pam (2004). The Cambridge Guide to English Usage. Cambridge: Cambridge University Press. ISBN 0-521-62181-X.
- Webster's Third New International Dictionary (1961; repr. 2002) Merriam-Webster, Inc.
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