Physics The ratio of the radiant energy transmitted to the total radiant energy incident on a given body. (noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "transmittance" in a sentence
"The claims focus on the diameter and strength of the screen wires and as well as on the screen's "transmittance" and "reflectance" properties."
"You have to be waving that antenna and ready for a little transmittance."
"The light Thrama 80 lens is designed for 80 percent light transmittance, making it perfect for dark days or evenings, but not quite bright enough for a night-time mountain bike ride or twilight crit."