The Collaborative International Dictionary of English v.0.48:

Cuba \Cuba\ (k[=u]"b[.a]), prop. n.
   1. a country on the island of Cuba.
      [WordNet 1.5]

   2. the largest island in the West Indies.
      [WordNet 1.5]

WordNet (r) 3.0 (2006):

Cuba
    n 1: a communist state in the Caribbean on the island of Cuba
         [syn: Cuba, Republic of Cuba]
    2: the largest island in the West Indies