GNU Collaborative International Dictionary of English

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1.       
   Ha (hä), interj. [AS.] An exclamation denoting surprise, joy, or grief. Both as uttered and as written, it expresses a great variety of emotions, determined by the tone or the context. When repeated, ha, ha, it is an expression of laughter, satisfaction, or triumph, sometimes of derisive laughter; or sometimes it is equivalent to  “Well, it is so.”
   
   [1913 Webster]
   
   Ha-has, and inarticulate hootings of satirical rebuke. Carlyle.
   
   [1913 Webster]