/ Dictionary / Index T tachometer: Meaning and Definition of Find definitions for: ta•chom•e•ter Pronunciation: (ta-kom'i-tur, tu-), [key] — n. any of various instruments for measuring or indicating velocity or speed, as of a machine, a river, or the blood. an instrument measuring revolutions per minute, as of an engine. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: tachometer (Thesaurus) tachograph tachy- Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language