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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Most amplifiers control voltage instead of current, but the link between current and voltage is made via the impedance of the drive unit, which will vary depending on temperature, frequency and the coil’s position inside the magnet.
—
Mark Sparrow, Forbes, 15 Jan. 2025
Esophageal impedance: In a hospital setting, this test uses a probe inserted into your nose to detect any bile in the esophagus over a day.
—Cristina Mutchler, Health, 11 Jan. 2025
But altering the impedance without also changing the transformer’s voltage ratio initially seemed impossible, Ndiaye says.
—IEEE Spectrum, 11 Dec. 2024
Sleep tracking is also a strong point, and the advanced bioelectrical impedance analysis gives you a wide spectrum of data like BMI, skeletal muscle and more.
—K. Thor Jensen, PCMAG, 3 Jan. 2025
See all Example Sentences for impedance 
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Mark Sparrow, Forbes, 15 Jan. 2025
Esophageal impedance: In a hospital setting, this test uses a probe inserted into your nose to detect any bile in the esophagus over a day.
—Cristina Mutchler, Health, 11 Jan. 2025
But altering the impedance without also changing the transformer’s voltage ratio initially seemed impossible, Ndiaye says.
—IEEE Spectrum, 11 Dec. 2024
Sleep tracking is also a strong point, and the advanced bioelectrical impedance analysis gives you a wide spectrum of data like BMI, skeletal muscle and more.
—K. Thor Jensen, PCMAG, 3 Jan. 2025
See all Example Sentences for impedance
Dictionary Entries Near impedance
Cite this Entry
“Impedance.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/impedance. Accessed 23 Jan. 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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