transmission

tranzˈmɪʃ(ə)n,trɑːnz-,-ns-/

noun

1. the passage of radio waves in the space between transmitting and receiving stations; also  :  the act or process of transmitting by radio or television

The equipment is used for the transmission of television signals.

2. an assembly of parts including the speed-changing gears and the propeller shaft by which the power is transmitted from an engine to a live axle; also  :  the speed-changing gears in such an assembly

The clutch is used to disconnect the transmission from the crankshaft.

3. an act, process, or instance of transmitting 

The transmission of a nerve impulse across a synapse.

4. something that is transmitted 

The transmission of knowledge from one to another.