from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A sound made in imitation of laughter.
- n. Slang An instance of amusement. Often used in the plural: drove past the old school just for ha-has.
- interj. Used to express amusement or scorn.
- n. See sunk fence.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- interj. An approximation of the sound of laughter.
- n. A laugh.
- n. Something funny; a joke.
- n. A ditch with one vertical side, acting as a sunken fence, designed to block the entry of animals into lawns and parks without breaking sightlines.
from the GNU version of the Collaborative International Dictionary of English
- n. A sunk fence; a fence, wall, or ditch, not visible till one is close upon it.
from The Century Dictionary and Cyclopedia
- An imitation of the sound of laughter. See ha.
- n. A fence formed by a foss or ditch, sunk between slopes and not perceived till approached; a sunk fence. Also written aha, haw-haw.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a loud laugh that sounds like a horse neighing
- n. a ditch with one side being a retaining wall; used to divide lands without defacing the landscape
French, exclamation of surprise, ha-ha (from its being designed not to be seen until closely approached).(American Heritage® Dictionary of the English Language, Fourth Edition)
From French haha, supposedly from ha! as an expression of surprise. (Wiktionary)