There are 2 definitions of ha in English:

ha1

Syllabification: ha
(also hah)

exclamation

Used to express surprise, suspicion, triumph, or some other emotion.
More example sentences
  • Agreeing that from time to time we need a bit of help from outside, we ask for the occasional ‘ah hah!’
  • They'll pore over transcripts from some news conference, looking for the two-bit money quote: ah hah!
  • Or else She will make sure they don't have power to run them anyway, hah!

Origin

natural utterance: first recorded in Middle English.

Definition of ha in:

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Word of the day anastrophe
Pronunciation: əˈnastrəfē
noun
the inversion of the usual order of words...

There are 2 definitions of ha in English:

ha2

Syllabification: ha

abbreviation

Hectare(s).

Definition of ha in: