[trans-mit-ns, tranz-]
Physics. the ratio of the radiant flux transmitted through and emerging from a body to the total flux incident on it: equivalent to one minus the absorptance.
Also called transmission.

1850–55; transmit + -ance

nontransmittance, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
transmittance (trænzˈmɪtəns)
1.  the act of transmitting
2.  physics reflectance Compare absorptance Also called: transmission factor, τ a measure of the ability of anything to transmit radiation, equal to the ratio of the transmitted flux to the incident flux; the reciprocal of the opacity. For a plate of material the ratio of the flux leaving the entry surface to that reaching the exit surface is the internal transmittance

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Transmittance decreases with increasing turbidity and dissolved salts.
Transmittance signals are taken directly from the spectrometer output electronics.
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