impedance
noun
im·ped·ance
im-ˈpē-dᵊn(t)s 
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
Body fat scales: These scales use bioelectrical impedance, which sends a weak electrical current through the body to estimate the percentage of body fat.
—
Lindsay Curtis, Health, 4 June 2025
Relatively efficient and with a minimum impedance of 6.4 ohms, these are amp-friendly speakers that can sing with 30 watts.
—Robert Ross, Robb Report, 26 Mar. 2025
Professional gamers tend to appreciate the lack of tactility in linear switches, as any physical impedance increases input lag between the action (pressing a key) and the reaction (your character moving, for example).
—Francisco Lahoz, PC Magazine, 31 May 2025
The base station records those changes in impedance, and transmits the data to an app on the mother's smartphone.
—Ben Coxworth, New Atlas, 17 May 2025
See All Example Sentences for impedance
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Lindsay Curtis, Health, 4 June 2025
Relatively efficient and with a minimum impedance of 6.4 ohms, these are amp-friendly speakers that can sing with 30 watts.
—Robert Ross, Robb Report, 26 Mar. 2025
Professional gamers tend to appreciate the lack of tactility in linear switches, as any physical impedance increases input lag between the action (pressing a key) and the reaction (your character moving, for example).
—Francisco Lahoz, PC Magazine, 31 May 2025
The base station records those changes in impedance, and transmits the data to an app on the mother's smartphone.
—Ben Coxworth, New Atlas, 17 May 2025
See All Example Sentences for impedance
Cite this Entry
“Impedance.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/impedance. Accessed 18 Jun. 2025.
Copy CitationMedical Definition
impedance
noun
im·ped·ance
im-ˈpēd-ᵊn(t)s
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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