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 admissi [..]

entree: the right to enter admission: the act of admitting someone to enter; "the surgery was performed on his second admission to the clinic" In electrical engineering, the [..]

n. Entrance, or the right or permission to enter.

The measure of how easy alternating current will flow. Measured in siemens.

The measure of the ease with which an alternative current flows in a circuit. The reciprocal of impedance.

(n) the right to enter(n) the act of admitting someone to enter

 - The reciprocal of Impedance (1/Z).

Licence. Shakespeare says. “Sir John, you are a gentleman of excellent breeding, of great admittance”—i.e., to whom great freedom is allowed (Merry Wives, ii. 2). The allusi [..]

a measure of electrical conduction, numerically equal to the reciprocal of the impedance (Z).

The measure of the ability of a circuit to conduct an alternating current.  The reciprocal of impedance, measured in siemens or mhos.  Symbol:  Y.

(symbol "Y") Measure of how easily AC will flow through a circuit. Admittance is the reciprocal of impedance and is measured in siemens.

[Y] The reciprocal of impedance, expressed in mhos [1/Z]. The sum of conductance [G] and susceptance [B], given as: Y = G + jB.

Reciprocal of impedance. Ratio of the electric current to the voltage. [Unit: siemens or S]

The act of admitting. Permission to enter, the power or right of entrance. Actual entrance, reception. (British,legal) The act of giving possession of a copyhold estate. (physics) The recipr [..]