The Collaborative International Dictionary of English v.0.48:

Highland \High"land\, n.
   Elevated or mountainous land; (often in the pl.) an elevated
   region or country; as, the Highlands of Scotland.
   [1913 Webster]

   Highland fling, a dance peculiar to the Scottish
      Highlanders; a sort of hornpipe.
      [1913 Webster]

WordNet (r) 3.0 (2006):

highland fling
    n 1: a vigorous Scottish reel