/ Dictionary / Index T tidal: Meaning and Definition of Find definitions for: tid•al Pronunciation: (tīd'l), [key] — adj. of, pertaining to, characterized by, or subject to tides: a tidal current. dependent on the state of the tide as to time of departure: a tidal steamer. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: tidal (Thesaurus) t.i.d. tidal basin 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