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

Example Sentences

Recent Examples on the Web And finally, this MacBook has more ports again, including an HDMI port, three USB-C ports with Thunderbolt 4, an SD card slot, and a high-impedance headphone jack. Medea Giordano, WIRED, 9 Sep. 2022 The audio jack supports high-impedance headphones, which is nice. Ewan Spence, Forbes, 10 June 2022 The AK HC2 has an analog amplifier powerful enough to drive high-impedance headphones and the option of a 4.4mm balanced output offers lower noise, higher output and clearer channel separation. Mark Sparrow, Forbes, 13 May 2022 The scale tracks this information using bioelectrical impedance technology, which basically sends a low electrical current through your body, then measuring the resistance of tissue in the body to the current. Maren Estrada, BGR, 27 Apr. 2022 The easy-to-drive ADVAR are designed specifically to pair well with a wide selection of audio devices thanks to their high sensitivity and low impedance. Mark Sparrow, Forbes, 12 Apr. 2022 Special care has been taken to marry a low-density nitrile surround to the cone, to match its impedance and reduce reflections from the cone edge. Mark Sparrow, Forbes, 17 Mar. 2022 Body fat analyzers: There are affordable, easy-to-use body fat analyzers out there, including skinfold calipers and bioelectrical impedance analyzers, which use low-level electrical currents to measure your body fat percentage. Suzie Glassman, Health.com, 31 Jan. 2022 The HybridDigital nCore design has a wide bandwidth, flat frequency response, clean clipping behavior with instant recovery, high current capability, and stability when used with demanding low-impedance speakers. Mark Sparrow, Forbes, 21 Sep. 2021 See More

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.

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 7 Dec. 2022.

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

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