The Collaborative International Dictionary of English v.0.48:

Highlander \High"land*er\, n.
   1. a soldier in a Scottish Highland regiment. [WordNet sense
      1]
      [WordNet 1.5]

   2. An inhabitant of highlands, especially of the Highlands of
      Scotland. [WordNet sense 2]
      [1913 Webster + WordNet 1.5]

WordNet (r) 3.0 (2006):

Highlander
    n 1: a soldier in a Scottish regiment from the Highlands
    2: a native of the Highlands of Scotland [syn: Highlander,
       Scottish Highlander, Highland Scot]