The list below of most common words in English cannot be definitive. It is based on an analysis of the Oxford English Corpus of over a billion words, and represents one study done by Oxford Online, associated with the Oxford English Dictionary.[1] This source includes writings of all sorts from "literary novels and specialist journals to everyday newspapers and magazines and from Hansard to the language of chatrooms, emails, and weblogs",[2] unlike some sources which use texts from only specific sources.[3]
The Reading Teacher's Book of Lists claims that the first 25 words make up about one-third of all printed material in English, and that the first 100 make up about one-half of all written material.[4]
Note that "word" may mean either a word form (essentially, a distinct spelling), or a lexeme (essentially, a "base" word or dictionary-entry). For instance the lexeme "be", listed below, includes occurrences of "are", "is", "were", "was", etc.[5] Note also that these top 100 lemmas listed below account for 50% of all the words in the Oxford English Corpus.[1]