Breadcrumb Home > 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: quadrumanous Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language