impedance

noun
im·​ped·​ance | \ im-ˈpē-dᵊn(t)s How to pronounce impedance (audio) \

Definition of impedance

: 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 Using bioelectric impedance analysis (BIA), this scale provides you with nine precise ways to look into your body measurements, including weight, body fat, water, muscle mass, BMI, BMR, visceral fat, bone mass, and protein. Popular Science, "Take your at-home workout routine to the next level," 14 Sep. 2020 Rolls-Royce claims torsional stiffness has increased and that the lower acoustic impedance of aluminum has helped to improve cabin refinement. Mike Duff, Car and Driver, "2021 Rolls-Royce Ghost Is a Tasteful Oasis in a Post-Opulent World," 1 Sep. 2020 Once on property, guests meet their guides and can undergo a functional movement screening (squats and awkward hurdle steps clock balance and asymmetry) and bioelectrical impedance analysis, which measures muscle mass and hydration level. Rebecca Misner, Condé Nast Traveler, "Hawaii's Best Wellness Retreat Is Nowhere Near the Beach," 10 Feb. 2020 Whenever Giulianotti wanted to cut something, the robot first measured the tissue’s impedance—or resistance to an electrical current—and, thus, the extent to which blood had been stanched. D. T. Max, The New Yorker, "Paging Dr. Robot," 23 Sep. 2019 There’s a button to enable 48-volt phantom power and what looks to be a switch for high-impedance headphones. Gordon Mah Ung, PCWorld, "Exclusive first look: Creative Labs' high-end Sound BlasterX AE-9 breaks cover," 8 Dec. 2018 An especially helpful feature is the Klein meter's LoZ, or low impedance, setting. Roy Berendsohn, Popular Mechanics, "Best New Tool: Klein Tools' Do-It-All Electrical Clamp Meter," 8 Jan. 2016 Low-impedance speakers put more stress on speaker wire, and not all speaker wire is intended for in-wall installations (though it should be clearly labeled either way). Don Melanson, Popular Mechanics, "The Setup: Building a Great Home Entertainment System," 18 July 2018 The diaper could use these elements to measure the conductivity and impedance between various areas of the diaper that are in the potential blast zone. Beth Mole, Ars Technica, "Alphabet’s Verily has a “smart diaper“ design that distinguishes pee from poo," 17 May 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'impedance.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of impedance

1886, in the meaning defined above

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Time Traveler for impedance

Time Traveler

The first known use of impedance was in 1886

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Statistics for impedance

Last Updated

18 Sep 2020

Cite this Entry

“Impedance.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/impedance. Accessed 25 Sep. 2020.

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More Definitions for impedance

impedance

noun
im·​ped·​ance | \ im-ˈpēd-ᵊn(t)s How to pronounce impedance (audio) \

Medical Definition of impedance

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

Britannica.com: Encyclopedia article about impedance

Comments on impedance

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