castilla castilian • castilleia · · · Info · Definitions · Characters · · castilla · · Text Latin · · Script 8 · · Length 3 · · Syllables Definitions · · · (noun) a region of central Spain; a former kingdom that comprised most of modern Spain and united with Aragon to form Spain in 1479. Synonyms: Castile, Castilla. · · Noun Definition 1 Characters · · a latin small letter a U+0061 c latin small letter c U+0063 i latin small letter i U+0069 l latin small letter l U+006C s latin small letter s U+0073 t latin small letter t U+0074