transmittance

UK: /trænzˈmɪt^əns/ US: (trans mit′ns, tranz-)

WordReference Random House Unabridged Dictionary of American English © 2025

trans•mit•tance  (trans mit′ns, tranz-), n. 

1. [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.

• transmit + -ance 1850–55

Collins Concise English Dictionary © HarperCollins Publishers::

transmittance / trænzˈmɪt^əns/ noun

1. the act of transmitting
2. 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
   Compare reflectance, absorptance

WordReference Random House Learner's Dictionary of American English © 2025

trans•mit /trænsˈmɪt, trænz-/   v., -mit•ted, -mit•ting. 

1. to send (a signal, etc.) to someone receiving, or to a destination; dispatch: [~ + object]
   Transmit this message at once!
   [no object]
   The submarine was transmitting, but there was no one to receive the signal.
2. Telecommunications [~ + object] to communicate, as information or news.
3. Pathology to spread (disease, etc.) to another:
   [~ + object] to transmit AIDS.
4. Physics to cause or allow (light, heat, etc.) to pass through a medium:
   [~ + object] Glass transmits light.

trans•mis•si•ble/trænsˈmɪsəbəl, trænz-/  trans•mit•ta•ble, adj. 
trans•mit•tal, trans•mit•tance, n. [uncountable] See -mit-.

WordReference Random House Unabridged Dictionary of American English © 2025

trans•mit  (trans mit′, tranz-), v., -mit•ted, -mit•ting. 
v.t. 

1. to send or forward, as to a recipient or destination;
   dispatch;
   convey.
2. to communicate, as information or news.
3. to pass or spread (disease, infection, etc.) to another.
4. to pass on (a genetic characteristic) from parent to offspring:
   The mother transmitted her red hair to her daughter.
5. [Physics.]
   • to cause (light, heat, sound, etc.) to pass through a medium.
   • to convey or pass along (an impulse, force, motion, etc.).
   • to permit (light, heat, etc.) to pass through:
     Glass transmits light.
6. [Radio and Television.] to emit (electromagnetic waves).

v.i. 

7. to send a signal by wire, radio, or television waves.
8. to pass on a right or obligation to heirs or descendants.

• Latin trānsmittere to send across, equivalent. to trāns- trans- + mittere to send
• Middle English transmitten 1350–1400

trans•mit ′ta•ble, trans•mit′ti•ble, adj. 
Synonyms

• 1. transfer, remit.
• 2. bear. See carry.