impedance

noun

im·​ped·​ance im-ˈpē-dᵊn(t)s 

: 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

The program includes initial and final medical examinations, diagnostic assessments, bioelectrical impedance analysis, a 3D body scan, an individualized nutrition plan, movement therapy, therapeutic massage and an online nutrition follow-up. — Ashley Lynch, Fort Worth Star-Telegram, 5 Oct. 2026

The program includes initial and final medical examinations along with diagnostic assessments, bioelectrical impedance analysis and a 3D body scan. — Ashley Lynch, Sacbee.com, 5 Oct. 2026

Existing comparison methods typically examine capacity, voltage, impedance, efficiency or power capability separately. — Rupendra Brahambhatt, Interesting Engineering, 20 Sep. 2026

The team also did impedance measurements to find out how fast the protection degrades. — Jacek Krywko, ArsTechnica, 31 Aug. 2026

Word History

First Known Use

1886, in the meaning defined above

Rhymes for impedance

• credence

Medical 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