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ain't

[eynt] /eɪnt/
1.
Nonstandard except in some dialects. am not; are not; is not.
2.
Nonstandard. have not; has not; do not; does not; did not.
Origin
1770-1780
1770-80; variant of amn't (contraction of am not) by loss of m and raising with compensatory lengthening of a; cf. aren't
Usage note
As a substitute for am not, is not, and are not in declarative sentences, ain't is more common in uneducated speech than in educated, but it occurs with some frequency in the informal speech of the educated, especially in the southern and south-central states. This is especially true of the interrogative use of ain't I? as a substitute for the formal and—to some—stilted am I not? or for aren't I?, considered by some to be ungrammatical, or for the awkward—and rare in American speech—amn't I? Some speakers avoid any of the preceding forms by substituting Isn't that so (true, the case)? Ain't occurs in humorous or set phrases: Ain't it the truth! She ain't what she used to be. It ain't funny. The word is also used for emphasis: That just ain't so! It does not appear in formal writing except for deliberate effect in such phrases or to represent speech. As a substitute for have not or has not and—occasionally in Southern speech—do not, does not, and did not, it is nonstandard except in similar humorous uses: You ain't heard nothin' yet! See also aren't.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for ain't

ain't

/eɪnt/
contraction
1.
am not, is not, are not, have not, or has not: I ain't seen it
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for ain't

1706, originally a contraction of am not, and in proper use with that sense until it began to be used as a generic contraction for are not, is not, etc., in early 19c. Cockney dialect of London; popularized by representations of this in Dickens, etc., which led to the word being banished from correct English.

Online Etymology Dictionary, © 2010 Douglas Harper
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Slang definitions & phrases for ain't

ain't

negation

Something or someone emphatically is not Said as a wry and intensive negator in a comparative statement: My joint? Buckingham palace it ain't/ Well, she sings OK, but Barbra Streisand she ain't

[perhaps fr a Yiddish syntactic pattern]


The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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Difficulty index for ain't

Few English speakers likely know this word

Word Value for ain

3
4
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