/ Dictionary / Index T tsi: Meaning and Definition of Find definitions for: tsi Pronunciation: [key] tons per square inch. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Tshombe tsimmes Related Content Daily Word Quiz: benevolent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language