transmission in WordNet English dictionary

1. an incident in which an infectious disease is transmitted
   infection  contagion  transmission 
   
2. the act of sending a message; causing a message to be transmitted
   transmission  transmittal  transmitting 
   
3. the gears that transmit power from an automobile engine via the driveshaft to the live axle
   transmission  transmission system 
   
4. communication by means of transmitted signals
   transmission 
   
5. the fraction of radiant energy that passes through a substance
   transmittance  transmission