Pronunciation: (rē-ak'tuns), [key]
1. Elect.the opposition of inductance and capacitance to alternating current, expressed in ohms: equal to the product of the sine of the angular phase difference between current and voltage and the ratio of the effective voltage to the effective current. Symbol: X Cf. capacitive reactance, inductive reactance.
2. Acoustics.See acoustic reactance.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.