-propagation-

n. [ L. propagatio: cf. F. propagation. ] [ 1913 Webster ]

1. The act of propagating; continuance or multiplication of the kind by generation or successive production; as, the propagation of animals or plants. [ 1913 Webster ]

There is not in nature any spontaneous generation, but all come by propagation. Ray. [ 1913 Webster ]

2. The spreading abroad, or extension, of anything; diffusion; dissemination; as, the propagation of sound; the propagation of the gospel. Bacon. [ 1913 Webster ]