/ Dictionary / Index A adultery: Meaning and Definition of Find definitions for: a•dul•ter•y Pronunciation: (u-dul'tu-rē), [key] — pl. -ter•ies. voluntary sexual intercourse between a married person and someone other than his or her lawful spouse. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: adultery (Thesaurus) adulterous adult home Related Content Daily Word Quiz: blithesome Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language