Lewis & Short

ăhă, interj. [acc. to Prisc. 570 P., primitive of the preced., but more rare], aha! ah! haha! an exclamation.

  1. I. Of reproof or denial: aha, tace, Plaut. Truc. 4, 4, 36; id. Rud. 2, 4, 6: aha, minime, id. Bacch. 1, 1, 54.
  2. II. Of laughter, Plaut. Bacch. 4, 7, 11.