transmission (Noun) — The act of sending a message; causing a message to be transmitted.
transmission (Noun) — Communication by means of transmitted signals.
transmission (Noun) — The fraction of radiant energy that passes through a substance.
transmission (Noun) — An incident in which an infectious disease is transmitted.
transmission (Noun) — The gears that transmit power from an automobile engine via the driveshaft to the live axle.