/ Dictionary / Index T TGV: Meaning and Definition of Find definitions for: TGV Pronunciation: [key] a high-speed French passenger train that runs on a separate track and is capable of a top speed of over 200 mph (320 km/h). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. T-group Th Related Content Daily Word Quiz: tenacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language