trans·mis·sion 
(trăns-mĭshən, trănz-)
(trăns-mĭshən, trănz-)n.
1.
a. The act or process of transmitting.
b. The fact of being transmitted.
2. Something, such as a message, that is transmitted.
3. An assembly, as in a motor vehicle, that transmits power from an engine to a driving axle, usually having a manually or automatically adjustable mechanism to control the balance of power and speed. Also called gearbox.
4. The sending of a signal, picture, or other information from a transmitter.
[Latin trānsmissiō, trānsmissiōn-, a sending across, from trānsmissus, past participle of trānsmittere, to transmit; see TRANSMIT.]
trans·missive (-mĭsĭv) adj.