/ Dictionary / Index D demarcate: Meaning and Definition of Find definitions for: de•mar•cate Pronunciation: (di-mär'kāt, dē'mär-kāt"), [key] — -cat•ed, -cat•ing. to determine or mark off the boundaries or limits of: to demarcate a piece of property. to separate distinctly: to demarcate the lots with fences. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: demarcate (Thesaurus) demantoid demarcation Related Content Daily Word Quiz: tactful Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language