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Entry 2 senses · 2 variants Webster, 1913

Aha

/ä-häʹ/ · A·ha · IPA /[ɑˈhɑ]/
01 interj. An exclamation expressing, by different intonations, triumph, mixed with derision or irony, or simple surprise.
  1. 1.
    An exclamation expressing, by different intonations, triumph, mixed with derision or irony, or simple surprise.
02 n. A sunk fence. See Ha-ha.
  1. 1.
    A sunk fence. See Ha-ha. See: Ha-ha