reactance

noun

re·​ac·​tance rē-ˈak-tən(t)s How to pronounce reactance (audio)
: the part of the impedance of an alternating-current circuit that is due to capacitance or inductance or both and that is expressed in ohms

Examples of reactance in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
The research showed that the behavior was driven by reactance, with a mix of anger and curiosity. Cornelia C. Walther, Forbes.com, 17 Aug. 2025 Research on psychological reactance shows that people do not like it when their autonomy or freedom is restricted. Tendayi Viki, Forbes, 20 Feb. 2025 This negative reaction is called psychological reactance, according to the Cleveland Clinic. Sara Sidner, CNN, 19 Jan. 2025

Word History

First Known Use

circa 1893, in the meaning defined above

Time Traveler
The first known use of reactance was circa 1893

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Cite this Entry

“Reactance.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/reactance. Accessed 5 Sep. 2025.

Medical Definition

reactance

noun
re·​ac·​tance rē-ˈak-tən(t)s How to pronounce reactance (audio)
: the part of the impedance of an alternating-current circuit that is due to capacitance or inductance or both and that is expressed in ohms

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