The Collaborative International Dictionary of English v.0.48:

Croatia \Croatia\ n.
   a Slavic-speaking country on the Adriatic, part of the Balkan
   region. It was formerly part of Yugoslavia.
   [WordNet 1.5 +PJC]

WordNet (r) 3.0 (2006):

Croatia
    n 1: a republic in the western Balkans in south-central Europe
         in the eastern Adriatic coastal area; formerly part of the
         Habsburg monarchy and Yugoslavia; became independent in
         1991 [syn: Croatia, Republic of Croatia, Hrvatska]