transmissionPronunciation: /tranzˈmɪʃ(ə)n, trɑːnz-, -ns-/Translate transmission | into French | into German | into Italian | into Spanish Definition of transmission noun 1 [mass noun] the action or process of transmitting something or the state of being transmitted:the transmission of the HIV virus [count noun] a programme or signal that is broadcast or sent out:television transmissions 2the mechanism by which power is transmitted from an engine to the axle in a motor vehicle: a three-speed automatic transmissionOrigin: early 17th century: from Latin transmissio(n-) (see trans-, mission)transmission in other Oxford dictionaries Definition of transmission in the US English dictionary