slang A word that can be used as a contraction for "is not," "am not," "are not," "have not," and "has not." I just ain't comfortable living in a big city like this.We ain't seen that movie yet.
ain’t 1
in. is not. (see also If it ain’t broke don’t fix it, If it ain’t broke, fix it till it is, That ain’t hay!, There ain’t no such thing as a free lunch.) Saying “Ain’t ain’t in the dictionary” ain’t so.