<p><strong>Noun:</strong></p><ul><li>Electricity<ul><li>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.</li><li>Compare: capacitive reactance, inductive reactance.</li><li>Acoustics: acoustic reactance.</li></ul></li></ul>