n. 增殖, 繁殖, 宣传

[医] 传播, 繁殖, 持续培养

Propagation \Prop`a*ga"tion\, n. [L. propagatio: cf. F.
propagation.]
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.