/ Dictionary / Index N New Castile: Meaning and Definition of Find definitions for: New" Castile' Pronunciation: [key] a region in central Spain: formerly a province. 27,933 sq. mi. (72,346 sq. km). Spanish, Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. New Carrollton New Castle Related Content Daily Word Quiz: agitated Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language