definitions
• synonyms

# reactance

[ree-ak-tuh ns]
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noun
1. Electricity. 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
2. Acoustics.

## Origin of .css-1fxfie5{font-size:22px;}@media (max-width:768px){.css-1fxfie5{font-size:18px;margin:0 10px 10px 0;word-break:break-all;word-wrap:break-word;-webkit-hyphens:auto;-moz-hyphens:auto;-ms-hyphens:auto;hyphens:auto;line-height:22px;}}reactance

First recorded in 1890–95; react + -ance
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

## Examples from the Web for reactance

### Historical Examples

• #### The combined effect of resistance and reactance is called impedance.

Physics

Willis Eugene Tower

• #### Reactance is the effect of self-induction in hindering the flow of current.

Physics

Willis Eugene Tower

• #### Impedance, however, does not equal the sum of resistance and reactance.

Physics

Willis Eugene Tower

• #### The degree in which any current is opposed by inductance is termed the reactance of that inductance.

British Dictionary definitions for reactance

# reactance

noun
1. the opposition to the flow of alternating current by the capacitance or inductance of an electrical circuit; the imaginary part of the impedance Z, Z = R + i X, where R is the resistance, i = √–1, and X is the reactance. It is expressed in ohmsCompare resistance (def. 3)
2. the opposition to the flow of an acoustic or mechanical vibration, usually due to inertia or stiffness. It is the magnitude of the imaginary part of the acoustic or mechanical impedance
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012