Webster's English Dictionary

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propagation

prop.a.ga.tion \.pra:p-*-'ga--sh*n\ \-shn*l, -sh*n-*l\ n : the act or 
   action of propagating : as  : increase (as of a kind of organism) in 
   numbers  : the spreading of something (as a belief) abroad or into new 
   regions :  DISSEMINATION : enlargement or extension (as of a crack) in a 
   solid body  - prop.a.ga.tion.al aj