Definition of "ain't" []

• Nonstandard Contraction of am not. (noun-possessive)
• Nonstandard Used also as a contraction for are not, is not, has not, and have not. (noun-possessive)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "I bet there are real voices in her head warning her to make sure Sasha's hair is combed, or that Malia doesn't have ashy elbows or avoid using the term ain't in a sentence!"
• "Rebecca Nicholson"You ain't heard nothin' yet," proclaimed Al Jolson in The Jazz Singer in 1927, heralding the end of the silent era in movie-making."
• ""There ain't no sheriff in this town, or at least there will not be for at least another six months," said Barclays Capital analyst Paul Horsnell ."