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

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

ha1

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

ha2

symbol for
  1. hectare
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].

Online Etymology Dictionary, © 2010 Douglas Harper