/ Dictionary / Index T tidal benchmark: Meaning and Definition of Find definitions for: tid'al bench'mark Pronunciation: [key] a benchmark used as a reference for tidal observations. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. tidal basin tidal bore Related Content Daily Word Quiz: cygnet Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language