/ Dictionary / Index I international radio silence: Meaning and Definition of Find definitions for: interna'tional ra'dio si"lence Pronunciation: [key] a radio silence observed on vessels at sea for two three-minute periods each hour to permit distress signals to be heard. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. international pitch international relations Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language