Wordnet 3.0
NOUN (1)
1. 
 a resident of Sicily; 
ADJECTIVE (1)
1. 
 of or relating to or characteristic of Sicily or the people of Sicily; 
- Example: "the Sicilian Mafia"
The Collaborative International Dictionary of English v.0.48:
Sicilian \Si*cil"i*an\, a.
   Of or pertaining to Sicily or its inhabitants.
   [1913 Webster]
   Sicilian vespers, the great massacre of the French in
      Sicily, in the year 1282, on the evening of Easter Monday,
      at the hour of vespers.
      [1913 Webster]
The Collaborative International Dictionary of English v.0.48:
Sicilian \Si*cil"i*an\, n.
   A native or inhabitant of Sicily.
   [1913 Webster]
WordNet (r) 3.0 (2006):
Sicilian
    adj 1: of or relating to or characteristic of Sicily or the
           people of Sicily; "the Sicilian Mafia"
    n 1: a resident of Sicily