/ Dictionary / Index K kinetic theory of heat: Meaning and Definition of Find definitions for: kinet'ic the'ory of heat' Pronunciation: [key] — Physics. Physics. a theory that the temperature of a body is determined by the average kinetic energy of its particles and that an inflow of heat increases this energy. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. kinetic theory of gases kinetic theory of matter Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language