Transmittal
Part of speech: noun
Definition: the act of transmitting a message; a transmission
Transmission
Part of speech: noun
Definition: The act of transmitting, e.g. data or electric power.The fact of being transmitted.Something that is transmitted, such as a message, picture or a disease; the sending of such a thing.The passage of a nerve impulse across synapses.An assembly of gears through which power is transmitted from the engine to the driveshaft in a motor car / automobile; a gearbox.
Example sentence: Of course, screening for HIV did essentially eliminate the transmission of this virus by transfusions.