/ Dictionary / Index T TM: Meaning and Definition of Find definitions for: TM Pronunciation: [key] trademark. See Tm Pronunciation: [key] — Symbol, Chem. thulium. t.m. Pronunciation: [key] true mean. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: tm (Thesaurus) T lymphocyte T-man Related Content Daily Word Quiz: crutiny Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language