impedance

noun

im·​ped·​ance im-ˈpē-dᵊn(t)s How to pronounce impedance (audio)
: something that impedes : hindrance: such as
a
: the apparent opposition in an electrical circuit to the flow of an alternating current that is analogous to the actual electrical resistance to a direct current and that is the ratio of effective electromotive force to the effective current
b
: the ratio of the pressure to the volume displacement at a given surface in a sound-transmitting medium

Examples of impedance in a Sentence

Recent Examples on the Web The standard model features support for Wear OS 4 and a bioelectrical impedance sensor for tracking body fat and body mass index. Sheena Vasani, The Verge, 8 June 2024 An option that’s taken off in gyms and workout studios, such as Anytime Fitness and Orangetheory Fitness is bioelectric impedance analysis, using devices such as the InBody or the Evolt 360. Allison Aubrey, NPR, 3 June 2024 It is made up of many small reflective elements that can be switched between high and low electrical impedance, which alters the phase of any wave that bounces off them. IEEE Spectrum, 3 May 2024 Measuring electrical impedance at the plant stem, a device transmits data to a receiver placed at the base of the plant—which infers water levbels and needs of the plant. IEEE Spectrum, 16 Jan. 2024 There's also bioelectrical impedance, which models the body as five cylinders of mass (the trunk and four limbs) and estimates body fat mass. Kevin Purdy, Ars Technica, 14 June 2023 The sensor measures the electrical impedance of the plant stem, which indirectly measures moisture in the plant based on ions and conductivity. IEEE Spectrum, 16 Jan. 2024 That enabled Smith and his cohorts to record the vocal tract impedance in different configurations in the mouth. Elizabeth Rayne, Ars Technica, 29 Dec. 2023 Bioelectrical impedance analysis, which uses electric signals to tell fat from muscle in the body, is becoming more common in medical offices. Lydia Denworth, Scientific American, 14 Dec. 2023

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'impedance.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use

1886, in the meaning defined above

Time Traveler
The first known use of impedance was in 1886

Dictionary Entries Near impedance

Cite this Entry

“Impedance.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/impedance. Accessed 21 Jun. 2024.

Medical Definition

impedance

noun
im·​ped·​ance im-ˈpēd-ᵊn(t)s How to pronounce impedance (audio)
1
: the apparent opposition in an electrical circuit to the flow of an alternating current that is analogous to the actual electrical resistance to a direct current and that is the ratio of effective electromotive force to the effective current
2
: the ratio of the pressure to the volume displacement at a given surface in a sound-transmitting medium
3
: opposition to blood flow in the circulatory system

More from Merriam-Webster on impedance

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