/ Dictionary / Index T ten-four: Meaning and Definition of Find definitions for: ten-four Pronunciation: (ten'fôr', -fōr'), [key] — interj. CB Radio Slang. (used to express affirmation or confirmation). Cf. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. tenfold ten-gallon hat Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language