/ Dictionary / Index D deter: Meaning and Definition of Find definitions for: de•ter Pronunciation: (di-tûr'), [key] — -terred, -ter•ring. to discourage or restrain from acting or proceeding: The large dog deterred trespassers. to prevent; check; arrest: timber treated with creosote to deter rot. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: deter (Thesaurus) detention home deterge Related Content Daily Word Quiz: lyceum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language