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  1. HA - In digital systems, a common abbreviation for Half Adder.
  2. ha (hä) - The twentysixth letter of the Arabic alphabet
  3. ha (KHä) - The sixth letter of the Arabic alphabet
  4. Ha - Chemical Symbol for Hahnium
  5. ha. - Hectare(s)
  6. h.a. - In geometry, high angle
  7. h.a. - hoc anno, latin for "in this year"

Ha (h&add;), 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."

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


© Webster 1913.

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