/ Dictionary / Index C Castilian: Meaning and Definition of Find definitions for: Cas•til•ian Pronunciation: (ka-stil'yun), [key] — n. the dialect of Spanish spoken in Castile. the official standard form of the Spanish language as spoken in Spain, based on this dialect. a native or inhabitant of Castile. —adj. of or pertaining to Castile. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: castilian (Thesaurus) Castile Castilla Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language