/ Dictionary / Index G GT: Meaning and Definition of Find definitions for: GT Pronunciation: [key] gigaton; gigatons. Also called an automobile in the style of a coupe, usually seating two but occasionally four, and designed for comfort and high speed. a high-speed, two-door model of a four-door sedan. gt. Pronunciation: [key] gilt. great. (in prescriptions) a drop. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. G-suit Gt. Br. Related Content Daily Word Quiz: fidelity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language