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permission or right to enter:
admittance into the exhibit room.
an act of .
actual entrance.
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.
Contemporary Examples

But for me, this admittance of uncertainty and doubts grounds Serial in reality.
Adnan Killed Her! No, Jay Did It! Serial’s Uncertain, True-to-Reality End Emily Shire December 17, 2014

Was this an admittance that the old approach was the wrong one, then?
Inside Nike Headquarters Winston Ross July 16, 2013

Italian jets are flying missions, albeit by their own admittance they haven’t actually bombed anything yet.
Gaddafi’s Best Friend in Europe Barbie Latza Nadeau March 22, 2011

Choosing not to pursue a perpetrator is not admittance of lies or false motives.
The Right’s Rape Trolls vs. Lena Dunham Emily Shire December 9, 2014

Historical Examples

He came in looking rather astonished at this mode of admittance.
Under False Pretences Adeline Sergeant

This led me to request a sight of that villa—a crown to the housekeeper got me admittance.
Night and Morning, Complete Edward Bulwer-Lytton

She had taken her place in the salons of the rich and great without laying for her admittance with her honor or her good name.
Tales of Two Countries Alexander Kielland

I let her in upon her tapping, and asking (half out of breath too) for admittance.
Clarissa, Volume 2 (of 9) Samuel Richardson

And yet he was allowed to beg for admittance, and to be shoved out of court because he had no friends.
Lady Anna Anthony Trollope

Ought you not to have exacted my admittance to the Comedie as a reparation for the insult?
The Three Cities Trilogy, Complete Emile Zola

noun
the right or authority to enter
the act of giving entrance
(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 susceptance y
n.

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.
admittance
(ād-mĭt’ns)
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.