The Collaborative International Dictionary of English v.0.48:

Mauritius \Mauritius\ prop. n.
   1. A country on the island of Mauritius.
      [WordNet 1.5]

   2. An island in the Indian Ocean.

   Syn: Ile de France.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Mauritius
    n 1: a parliamentary state on the island of Mauritius [syn:
         Mauritius, Republic of Mauritius]
    2: an island in the southwestern Indian Ocean