ha /ˈhɑ/



 Ha interj.  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.”
    Ha-has, and inarticulate hootings of satirical rebuke.   --Carlyle.

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 HA
      n : (astronomy) the angular distance of a celestial point
          measured westward along the celestial equator from the
          zenith crossing; the right ascension for an observer at a
          particular location and time of day [syn: hour angle]