/ Dictionary / Index T tachymeter: Meaning and Definition of Find definitions for: ta•chym•e•ter Pronunciation: (ta-kim'i-tur, tu-), [key] — n. Survey. any of several instruments for rapidly determining distances, directions, and differences of elevation. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: tachymeter (Thesaurus) tachylyte tachyon 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