What does "ain't" mean? [closed]

What does the contraction ain't mean? Is it appropriate to use it in formal settings?

Solution 1:

Ain't is the same as aren't and means are not but it is also used for am not, is not, has not, have not.

It definitely should not be used in formal settings.

Solution 2:

From the Merriam-Webster:

Main Entry: ain't
Pronunciation: \ˈānt\
Etymology: contraction of are not

Quoting @nohat :

The common bit of schoolyard wisdom that “ain’t ain’t in the dictionary, so ain’t ain’t a word” turns out to be untrue. Every online dictionary that I’ve ever looked in contained an entry for ain’t.

It is a colloquial word, informal, so probably shouldn't be used in formal settings,unless you are a politican:)