Prop`a*ga"tion (?), n. [L. propagatio: cf. F. propagation.]
The act of propagating; continuance or multiplication of the kind by generation or successive production; as, the propagation of animals or plants.
There is not in nature any spontaneous generation, but all come by propagation.
The spreading abroad, or extension, of anything; diffusion; dissemination; as, the propagation of sound; the propagation of the gospel.
© Webster 1913.