(used as an exclamation of triumphant discovery, mockery, contempt, irony, surprise, etc., according to the manner of utterance.)
Other definitions for AHA (2 of 3)
American Heart Association.
Other definitions for A.H.A. (3 of 3)
American Historical Association.
American Hospital Association.
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British Dictionary definitions for aha
an exclamation expressing triumph, surprise, etc, according to the intonation of the speaker
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