'Castilian' definitions:

Definition of 'Castilian'

From: WordNet
noun
The Spanish language as spoken in Castile

Definition of 'Castilian'

From: GCIDE
  • Castilian \Cas*til"ian\, n. [Sp. castellano, from Castila, NL. Castilia, Castella. Castile, which received its name from the castles erected on the frontiers as a barrier against the Moors.]
  • 1. An inhabitant or native of Castile, in Spain. [1913 Webster]
  • 2. The Spanish language as spoken in Castile. [1913 Webster]