Dictionary

impedance

noun im·ped·ance \im-ˈpē-dən(t)s\

Definition of IMPEDANCE

:  something that impedes :  hindrance: 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
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First Known Use of IMPEDANCE

1886
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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