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In linguistic typology, a synthetic language is a language with a high morpheme-per-word ratio, as opposed to a low morpheme-per-word ratio in what is described as an isolating language. This linguistic classification is largely independent of morpheme-usage classifications (such as fusional, agglutinative, etc.), although there is a common tendency for agglutinative languages to exhibit synthetic properties.
Synthetic and isolating languages 
Synthetic languages are frequently contrasted with isolating languages. It is more accurate to conceive of languages as existing on a continuum, with the isolating pole (consistently one morpheme per word) at one end and highly polysynthetic languages (in which a single inflected verb may contain as much information as an entire English sentence with various words like a noun an adjective and an adverb) at the other extreme. Synthetic languages tend to lie around the middle of this scale.
Synthetic languages are numerous and well-attested, the most commonly cited being Indo-European languages such as Sanskrit, Spanish, Persian, Armenian, Greek, Latin, Lithuanian, German, Italian, French, Romanian, Russian, Ukrainian, Serbocroatian language, Polish, Slovak and Czech, as well as many languages of the Americas, including Navajo, Nahuatl, Mohawk and Quechua. Synthetic languages are identified also in Kartvelian languages, for example the Georgian language.
Forms of synthesis 
There are several ways in which a language can exhibit synthetic characteristics:
Derivational synthesis 
- German: Aufsichtsratsmitgliederversammlung => "Supervision + council + member + assembly" meaning "meeting of members of the supervisory board" ("with" and "link" (as in link of a chain) form a derivation that is the German word for "member"; similarly, "completion", "collect" and "noun" form a derivation that means "meeting", with both "ver-" and "-ung" being bound morphemes)
- Greek: υπερχοληστερολαιμία => "overmuch/high-cholesterol-blood+-ia(neuter feminine suffix)" meaning "hypercholesterolemia", i.e. the presence of high levels of cholesterol in the blood.
- Polish: przystanek => "beside-stand-little" meaning "bus stop"
- English: antidisestablishmentarianism => "against-ending-institutionalize-condition-advocate-ideology" meaning "the movement to prevent revoking the Church of England's status as the official church" (of England, Ireland, and Wales).
- Russian: достопримечательность (dostoprimechatel'nost') => "Deserving (intensifying prefix)-notable-(noun suffix)" meaning "place of interest"
- Malayalam: അങ്ങനെയല്ലാതായിരിക്കുമ്പോളൊക്കെത്തന്നെ ('angnganeyallaathaayirikkumpOLokkeththanne') => "such/so-not-has-been-when-occasions-all-exclusively" meaning "on all such occasions when it has been not so"
Relational synthesis 
- Italian: comunicandovele => "communicating-you(plural)-those(feminine, plural)" meaning '(while or by) communicating those(feminine, plural) to you(plural)'
- Spanish: escribié-ndo-me-lo => "write-GERUND-me-it(masculine/neuter)" 'writing it to me'
- Nahuatl: ō-c-ā-lti-zquiya => "PAST-3SG.OBJ-water-CAUS-IRREAL" meaning 'she would have bathed him'
- Latin: com-prim-unt-ur => "together-crush-they-PASSIVE" 'They are crushed together'
- Japanese: 見させられがたい (misaseraregatai) => "see-causative-passive-difficult" 'it's difficult to be shown (this)'
- Finnish: juoksentelisinkohan => "run-erratic motion-conditional-I-question-casual" 'I wonder if I should run around (aimlessly)'
- Turkish: Afyonkarahisarlılaştıramayabileceklerimizden misiniz? => "Afyonkarahisar-from/citizen of-transform-transformed into (makes the previous suffix passive)-not-be able-(future tense)-(plural)-we-among-(question)-are you?" meaning "Are you (all) amongst the ones whom we will not be able to make citizens of Afyonkarahisar?"
- Georgian: gadmogwakhtunebinebdneno (gad-mo-gw-a-xtun-eb-in-eb-d-nen-o) means "They said that they would be forced by them (the others) to make someone to jump over in this direction". The word describes the whole sentence that incorporates tense, subject, object, relation between them, direction of the action, conditional and causative markers etc.
Degrees of synthesis 
In order to demonstrate the "continuum" nature of the isolating-synthetic-polysynthetic classification, some examples are shown below:
More isolating 
明天 我 的 朋友 會 爲 我 做 生日 蛋糕 明天 我 的 朋友 会 为 我 做 生日 蛋糕 míngtiān wǒ de péngyou huì wèi wǒ zuò shēngri dàngāo tomorrow I (genitive particle(='s)) friend will for I make birthday cake "Tomorrow my friends will make a birthday cake for me."
Mandarin Chinese lacks inflectional morphology almost entirely, and most words consist of either one or two syllable morphemes, especially two due to the very numerous compound words. This makes it noticeably more isolating than many other languages, even slightly more so than English.
However, with rare exceptions, each syllable in Mandarin (corresponding to a single written character) represents a morpheme with an identifiable meaning, even if many of such morphemes are bound. This gives rise to the common misconception that Chinese consists exclusively of "words of one syllable". As the sentence above illustrates, however, Chinese words expressing even the simplest concepts—such as míngtiān 'tomorrow' (míng "bright" + tīan "day") and péngyou 'friend' (a compound of péng and yǒu, both of which mean 'friend')—are typically synthetic compound words.
Rather isolating 
- English: "He travelled by hovercraft on the sea." Largely isolating, but travelled (although also possible to say "did travel" instead) and hovercraft each have two morphemes per word, the former being an example of relational synthesis (inflection), and the latter of derivational synthesis (derivation).
Rather synthetic 
- Japanese: 私たちにとって、この泣く子供の写真は見せられがたいものです。(Watashitachi ni totte, kono naku kodomo no shashin wa miseraregatai mono desu) means strictly literally, "In our case, these pictures of children crying are things that are difficult to be shown," meaning 'We cannot bear being shown these pictures of children crying' in more idiomatic English. In the example, virtually every word has more than one morpheme and some have up to five.
Very synthetic 
- Finnish: Käyttäytyessään tottelemattomasti oppilas saa jälki-istuntoa means, "Should he/she behave in an insubordinate manner, the student will get detention." Structurally: behaviour (present/future tense) (of his/hers) obey (without) (in the manner/style) studying (he/she who (should be)) gets detention (some). Practically every word is derived and/or inflected. However, this is quite formal language, and (especially in speech) would have various words replaced by more analytic structures: Kun oppilas käyttäytyy tottelemattomasti, hän saa jälki-istuntoa meaning 'When the student behaves in an insubordinate manner, he/she will get detention'.
- Georgian: gadmogvakhtunebinebdneno (gad-mo-gw-a-xtun-eb-in-eb-d-nen-o) means 'They said that they would be forced by them (the others) to make someone to jump over in this direction'. The word describes the whole sentence that incorporates tense, subject, direct and indirect objects, their plurality, relation between them, direction of the action, conditional and causative markers, etc.
- Hungarian: megszentségteleníthetetlenségeskedéseitekért means "for/as a reward for/due to your (plural) continuous pretending(s) to be indesecretable". Morphemes separated: meg-SZENT-ség-telen-ít-het-etlen-ség-es-ked-és-e-i-tek-ért, stem: "szent".
- Mohawk: Washakotya'tawitsherahetkvhta'se means "He ruined her dress" (strictly, 'He made the-thing-that-one-puts-on-one's body ugly for her'). This one inflected verb in this case expresses the idea that would be conveyed in various words in a more analytic language such as English.
Oligosynthetic languages are a theoretical notion created by Benjamin Whorf with no known examples existing in natural languages. Such languages would be functionally synthetic, but make use of a very limited array of morphemes (perhaps just a few hundred). Whorf proposed that Nahuatl was oligosynthetic, but this has since been discounted by most linguists.
See also 
- Analytic language
- Isolating language
- Morphology (linguistics)
- Linguistic typology
- Bound morpheme
- SIL: What is a morphological process?
- SIL: What is derivation?
- SIL: Comparison of inflection and derivation
- Lexicon of Linguistics: Inflection, Derivation
- Lexicon of Linguistics: Base, Stem, Root
- PDF (275 KiB), chapter 9 of Halvor Eifring & Rolf Theil: Linguistics for Students of Asian and African Languages