/ Dictionary / Index S signboard: Meaning and Definition of Find definitions for: sign•board Pronunciation: (sīn'bôrd", -bōrd"), [key] — n. a board bearing a sign. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: signboard (Thesaurus) signature tune signed English Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language