impedance

noun im·ped·ance \ im-ˈpē-dᵊn(t)s \

Definition of impedance

: 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

Recent Examples of impedance from the Web

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First Known Use of impedance

1886

in the meaning defined above

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Medical Dictionary

impedance

noun im·ped·ance \ im-ˈpēd-ᵊn(t)s \

medical Definition of impedance

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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