prop·a·ga·tion /ˌprɑpəˈgeʃən/
  增殖,繁殖,廣傳
  prop·a·ga·tion /ˌprɑpəˈgeʃən/ 名詞
  繁殖,傳播
  propagation
  傳播
  Prop·a·ga·tion 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.
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  propagation
       n 1: the spreading of something (a belief or practice) into new
            regions [syn: extension]
       2: the act of producing offspring or multiplying by such
          production [syn: generation, multiplication]
       3: the movement of a wave through a medium