There are 2 definitions of ha ha in English:

ha ha1

Syllabification: ha ha
Pronunciation: /ˈhä ˌhä
 
/
(also he he)

exclamation

Used to represent laughter or amusement.
More example sentences
  • Congrats on all the nominations Rick, I will vote for you once you vote for me in the best blog and best photoblog categories, he he
  • He he, it's amazing how nerdy projects can bring people together.
  • I just wanted to let you all know because I'm certain you'd be fretting until Monday otherwise. Ha ha ha!

Origin

natural utterance: first recorded in Old English (compare with ha1).

Definition of ha ha in:

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Word of the day animalcule
Pronunciation: ˌanɪˈmalkjuːl
noun
a microscopic animal

There are 2 definitions of ha ha in English:

ha-ha2

Syllabification: ha-ha
Pronunciation: /ˈhä ˌhä, ˌhä ˈhä
 
/

noun

A ditch with a wall on its inner side below ground level, forming a boundary to a park or garden without interrupting the view.
More example sentences
  • By removing the scrubby hawthorns that had grown up around the ha-ha, or sunken ditch, we have opened up the view that Jane Austen knew, in the true English landscape garden tradition.
  • Three fishing ponds were joined together to create two lakes, separated by a dam-cum-bridge and a ha-ha - a sunken wall that kept grazing animals out of the park.
  • Or possibly, it is just the gap where the ha-ha is broken to allow the turn-in from the road.

Origin

early 18th century: from French, said to be from the cry of surprise on suddenly encountering such an obstacle.

Definition of ha ha in: