/ Dictionary / Index I inertance: Meaning and Definition of Find definitions for: in•ert•ance Pronunciation: (in-ûr'tns, i-nûr'-), [key] — n. Acoustics. the effect of inertia in an acoustic system, an impeding of the transmission of sound through the system. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. inert inert gas Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language