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ha-ha1

or ha·ha, ha ha

[hah-hah, hah-hah]
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interjection, noun
  1. (used as an exclamation or representation of laughter, as in expressing amusement or derision.)
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Compare haw-haw.

Origin of ha-ha1

before 1000; Middle English, Old English; of imitative origin

ha-ha2

[hah-hah]
noun
  1. sunk fence.
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Origin of ha-ha2

1705–15; < French haha repetitive compound based on ha! exclamation of surprise
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for ha-ha

ha-ha1

haw-haw

interjection
  1. a representation of the sound of laughter
  2. an exclamation expressing derision, mockery, surprise, etc
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ha-ha2

haw-haw

noun
  1. a wall or other boundary marker that is set in a ditch so as not to interrupt the landscape
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Word Origin

C18: from French haha, probably based on ha! ejaculation denoting surprise
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for ha-ha

also haha, used of laughter since ancient times; cf. Old English ha ha, Greek ha ha, Latin hahae. A different attempt at representation is in py-hy (1580s).

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Online Etymology Dictionary, © 2010 Douglas Harper