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[hah]
noun
  1. the 26th letter of the Arabic alphabet, representing a glottal spirant consonant sound.
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Origin of

From Arabic
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for

Ha

abbreviation for
  1. Hawaii
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ha

1

hah

interjection
  1. an exclamation expressing derision, triumph, surprise, etc, according to the intonation of the speaker
  2. (reiterated) a representation of the sound of laughter
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ha

2
symbol for
  1. hectare
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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

c.1300, natural expression of surprise, distress, etc.; found in most European languages; in Old English, Greek, Latin, Old French as ha ha. A ha-ha (1712), from French, was "an obstacle interrupting one's way sharply and disagreeably;" so called because it "surprizes ... and makes one cry Ah! Ah!" [Alexander Le Blond, "The Theory and Practice of Gardening," 1712].

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Online Etymology Dictionary, © 2010 Douglas Harper