transmittance

noun
trans·​mit·​tance | \tran(t)s-ˈmi-tᵊn(t)s, tranz-\

Definition of transmittance 

2 : the fraction of radiant energy that having entered a layer of absorbing matter reaches its farther boundary

First Known Use of transmittance

circa 1855, in the meaning defined at sense 1

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The first known use of transmittance was circa 1855

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transmittance

noun
trans·​mit·​tance | \-ˈmit-ᵊn(t)s \

Medical Definition of transmittance 

2 : the fraction of radiant energy that having entered a layer of absorbing matter reaches its farther boundary

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