- A sound made in imitation of laughter. (noun)
- Slang An instance of amusement. Often used in the plural: drove past the old school just for ha-has. (noun)
- Used to express amusement or scorn. (interjection)
- See sunk fence. (noun)
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.