/ Dictionary / Index P prime time: Meaning and Definition of Find definitions for: prime' time' Pronunciation: [key] — Radio and Television. Radio and Television. the hours, generally between 8 and 11 p.m., usually having the largest audience of the day. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. primero primeval Related Content Daily Word Quiz: simian Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language