/ Dictionary / Index T tidal basin: Meaning and Definition of Find definitions for: tid'al ba"sin Pronunciation: [key] an artificial body of water open to a river, stream, etc., subject to tidal action. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. tidal tidal benchmark 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