Source : Webster's Revised Unabridged Dictionary (1913)

Highland \High"land\, n.
   Elevated or mountainous land; (often in the pl.) an elevated
   region or country; as, the Highlands of Scotland.

   {Highland fling}, a dance peculiar to the Scottish
      Highlanders; a sort of hornpipe.

Source : WordNet®

highland fling
     n : a vigorous Scottish reel