/ Dictionary / Index A acoustic reactance: Meaning and Definition of Find definitions for: acous'tic react'ance Pronunciation: [key] — Acoustics. Acoustics. acoustic impedance caused by the inertia and elasticity of the transmitting medium. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. acoustic phonetics acoustic resistance Related Content Daily Word Quiz: lunar Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language