/ Dictionary / Index S sex act: Meaning and Definition of Find definitions for: sex' act" Pronunciation: [key] sexual intercourse; copulation. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. sex abuse sexagenarian Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language