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[trans-mit-ns, tranz-] /trænsˈmɪt ns, trænz-/
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.
Origin of transmittance
First recorded in 1850-55; transmit + -ance
Related forms
nontransmittance, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for transmittance
Historical Examples
  • Music fills all which contains life, and uses all materials for its transmittance.

    Seed Thoughts for Singers Frank Herbert Tubbs
British Dictionary definitions for transmittance


the act of transmitting
(physics) Also called transmission factor. 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 τ Compare reflectance, absorptance
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for transmittance

1855, from transmit + -ance.

Online Etymology Dictionary, © 2010 Douglas Harper
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