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  1. permission or right to enter: admittance into the exhibit room.
  2. an act of admitting.
  3. actual entrance.
  4. Electricity. the measure of the ability of a circuit to conduct an alternating current, consisting of two components, conductance and susceptance; the reciprocal of impedance, expressed in mhos. Symbol: Y
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Origin of admittance

First recorded in 1585–95; admit + -ance
Related formsre·ad·mit·tance, noun


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1. access. See entrance1.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for admittance


  1. the right or authority to enter
  2. the act of giving entrance
  3. electrical engineering the reciprocal of impedance, usually measured in siemens. It can be expressed as a complex quantity, the real part of which is the conductance and the imaginary part the susceptanceSymbol: y
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for admittance


1580s, "the action of admitting," formed in English from admit + -ance (if from Latin, it would have been *admittence; French uses accès in this sense). Used formerly in senses where admission now prevails. Admissure was used in this sense from mid-15c.

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Online Etymology Dictionary, © 2010 Douglas Harper

admittance in Science


  1. A measure of the ability of a circuit or component to allow current flow when exposed to AC voltages (its AC conductance). It is equal to the reciprocal of the impedance of the circuit, just as conductivity is equal to the reciprocal of resistance, and is similarly measured in mhos.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.