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
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With a high sensitivity of 100dB/mW and a low impedance of 16Ω, these earphones are easy to pair with a wide range of audio devices.
—
Mark Sparrow, Forbes.com, 19 Sep. 2025
The Galaxy Watch 8 has a bioelectrical impedance analysis (BIA) sensor that can analyze your body composition like a smart scale, but the Apple Watch Series 11 can monitor your blood pressure over time and warn you of potential hypertension.
—PC Magazine, 12 Sep. 2025
Electrochemical impedance results showed lower resistance, faster ion flow, and fewer corrosive by-products.
—Neetika Walter, Interesting Engineering, 30 Aug. 2025
This study’s detection is done with label-free impedance biosensors.
—Diya Dwarakanath, IEEE Spectrum, 11 Aug. 2025
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Mark Sparrow, Forbes.com, 19 Sep. 2025
The Galaxy Watch 8 has a bioelectrical impedance analysis (BIA) sensor that can analyze your body composition like a smart scale, but the Apple Watch Series 11 can monitor your blood pressure over time and warn you of potential hypertension.
—PC Magazine, 12 Sep. 2025
Electrochemical impedance results showed lower resistance, faster ion flow, and fewer corrosive by-products.
—Neetika Walter, Interesting Engineering, 30 Aug. 2025
This study’s detection is done with label-free impedance biosensors.
—Diya Dwarakanath, IEEE Spectrum, 11 Aug. 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 24 Sep. 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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