Definition of impedance in English:

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Pronunciation: /imˈpēdns/


The effective resistance of an electric circuit or component to alternating current, arising from the combined effects of ohmic resistance and reactance. See also acoustic impedance.
  • Impedance is usually expressed as a complex quantity Z = R + jX, where R is resistance, X is reactance, and j is the imaginary square root of 1.
Example sentences
  • The constant impedance is maintained despite changes in temperature and voltage by using two external resistors to hold the impedances for all the I / O pins, which can number hundreds in the larger parts.
  • An impedance matching circuit is provided for each signal-carrying wire pair of the first and second wire pair sets.
  • The transponder alters the impedance of the tuned circuit in accordance with the coded pattern.


Impedance is a specialized electrical term (as defined above), while impediment is an everyday term meaning ‘a hindrance or obstruction’: a low-impedance power supply; interpreting his handwriting was an impediment to getting business done.

Words that rhyme with impedance

antecedence, credence

For editors and proofreaders

Syllabification: im·ped·ance

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