/ Dictionary / Index T thermal conductivity: Meaning and Definition of Find definitions for: ther'mal con'ductiv'ity Pronunciation: [key] — Physics. Physics. the amount of heat per unit time per unit area that can be conducted through a plate of unit thickness of a given material, the faces of the plate differing by one unit of temperature. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. thermal barrier thermal diffusion Related Content Daily Word Quiz: wizened Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language