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impedance definition

im·ped·ance (im pēd′'ns)

noun

  1. the total opposition offered by an electric circuit to the flow of an alternating current of a single frequency: it is a combination of resistance and reactance and is measured in ohms: the reciprocal of admittance: symbol, Z
  2. the ratio of the force per unit area to the volume displacement of a given surface across which sound is being transmitted

Etymology: < imped(e) + -ance

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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