/ Dictionary / Index C coefficient of expansion: Meaning and Definition of Find definitions for: coeffi'cient of expan'sion Pronunciation: [key] — Physics. Physics. the fractional change in length, area, or volume per unit change in temperature of a solid, liquid, or gas at a given constant pressure. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. coefficient of elasticity coefficient of fineness Related Content Daily Word Quiz: agitated Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language