Breadcrumb Home > Dictionary > Index C coastal: Meaning and Definition of Find definitions for: coast•al Pronunciation: (kōs'tl), [key] — adj. of, relating to, bordering on, or located near a coast: The coastal regions are inundated at high tide. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: coastal (Thesaurus) coast coastal plain ✖ Related Content Daily Word Quiz: evanescent Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language