transmission

(noun) the act of sending a message; causing a message to be transmitted. Synonyms: transmittal, transmitting.

(noun) communication by means of transmitted signals.

(noun) the fraction of radiant energy that passes through a substance. Synonyms: transmittance.

(noun) an incident in which an infectious disease is transmitted. Synonyms: infection, contagion.

(noun) the gears that transmit power from an automobile engine via the driveshaft to the live axle. Synonyms: transmission system.