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

before 1000; Middle English, Old English; of imitative orig.

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2 [hah-hah]

1705–15; < French haha repetitive compound based on ha! exclamation of surprise

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
ha-ha or haw-haw1 (ˈhɑː ˈhɑː)
1.  a representation of the sound of laughter
2.  an exclamation expressing derision, mockery, surprise, etc
haw-haw or haw-haw1

ha-ha or haw-haw2 (ˈhɑː hɑː)
a wall or other boundary marker that is set in a ditch so as not to interrupt the landscape
[C18: from French haha, probably based on ha! ejaculation denoting surprise]
haw-haw or haw-haw2
[C18: from French haha, probably based on ha! ejaculation denoting surprise]

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Example sentences
Well, hopefully in five years there will be jobs, haha.
Haha, it's a common phenomenon for me as well as my friends.
Haha, interesting that you've chosen this sort of diet.
Haha yes, thanks for bringing this up for it made my day.
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