transmittance

noun

trans·​mit·​tance tran(t)s-ˈmi-tᵊn(t)s 

tranz-

1

: transmission

2

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

Examples of transmittance in a Sentence

Recent Examples on the Web

The rating also includes the solar heat gain coefficient (SHGC) and visible transmittance (VT), both numbers between 0 and 1. — Nafeesah Allen, Better Homes & Gardens, 7 July 2026

These experiments differed in magnitude and spectra of light transmittance, shading patterns, and spatial coverage. — Joshua Pearce, Forbes.com, 17 Apr. 2026

When heated to 40 degrees Celsius, light transmittance increases to around 78 percent at 550 nanometers. — Neetika Walter, Interesting Engineering, 13 Jan. 2026

Senate Bill 46, passed in 2024, allows vehicle owners to tint their windshields if the tinting allows at least 70% light transmittance. — Marina Johnson, Louisville Courier Journal, 18 Sep. 2025

Windshield tinting Under Senate Bill 46, vehicle owners are allowed to tint their windshields if the tinting allows 70% light transmittance. — Hannah Pinski, The Courier-Journal, 12 July 2024

Made of several layers of materials and fabric, they are designed to provide thermal resistance (known as R-value) and prevent thermal transmittance conductivity (known as U-value). — Heidi Wachter, Treehugger, 14 July 2023

The prototype four-pixel device can switch its light transmittance with less than 5 volts in just 625 microseconds—which would translate to more than 1,000 frames per second. — IEEE Spectrum, 10 Mar. 2023

Thus, in sunlit nesting environments, less pigmentation will increase the detrimental effect of transmittance, but more pigmentation will increase the detrimental effect of absorbance. — Seriously Science, Discover Magazine, 1 June 2018

Word History

First Known Use

circa 1855, in the meaning defined at sense 1

Rhymes for transmittance

• acquittance
• admittance
• emittance
• remittance
• pittance

Medical Definition

transmittance

noun

trans·​mit·​tance -ˈmit-ᵊn(t)s 

1

: transmission

2

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