slang contraction of is not, are not, am not, do not or does not.

informal language;teachers hate it;used in texting,talking

A word so easy to say and understand, English teachers don't want you using it and make you read war and peace.

Ain't= Am not

am not, are not, is not; have not, has not; do not, does not, did not.

Short for "am not" and for nothing else – not even "is not", for "it ain't" would just be "it am not". The only correct use is "I ain't" which is a contraction of "I am not". So, don't say e.g. "you ain't" which would only mean "you am not".

Originally a non-slang word, ain't began as a contraction for "am not", as in "I ain't stupid." When people began to use it improperly as in "He ain't", which should have been "He isn't", people came to consider it improper use of language. Today, it's known to be used predominantly in the south and by uneducated people.

Contraction of am not and slang contraction for anything else.