admittance

[ad-mit-ns]
noun
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

Origin:
1585–95; admit + -ance

readmittance, noun


1. access. See entrance1.
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World English Dictionary
admittance (ədˈmɪtəns)
 
n
1.  the right or authority to enter
2.  the act of giving entrance
3.  electrical engineering y 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 susceptance

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Etymonline
Word Origin & History

admittance
1580s, "the action of admitting," formed in Eng. from admit (if from L., it would have been *admittence; Fr. uses accès in this sense). Used formerly in senses where admission now prevails.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
admittance   (ād-mĭt'ns)  Pronunciation Key 
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
That, in itself, is admittance that there are no deities.
Initially the pool attendants denied him admittance.
The missionaries who have attempted to find admittance, seem never to have
  succeeded.
Anyone in the theater can gain admittance to this secret section so long as
  they are wearing one diamond stud in their left ear.
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