Propagation

Part of speech: noun (n.)

1. 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. Ray.

2. The spreading abroad, or extension, of anything; diffusion; dissemination; as, the propagation of sound; the propagation of the gospel. Bacon.