/ Dictionary / Index T triple point: Meaning and Definition of Find definitions for: tri'ple point' Pronunciation: [key] — Physics. Physics. the particular temperature and pressure at which the solid, liquid, and gaseous phases of a given substance are all at equilibrium with one another. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. triple play triple rhyme Related Content Daily Word Quiz: eureka Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language