Webster's English Dictionary

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fertilization

fer.til.iza.tion \.f*rt-*l-*-'za--sh*n\ \-shn*l, -sh*n-*l\ n : an act or 
   process of making fertile : as  : the application of fertilizer  : an act 
   or process of fecundation, insemination, impregnation, or polli nation : 
   the process of union of two germ cells whereby the somatic chromosome  
   number is restored and the development of a new individual is initiated - 
   fer.til.iza.tion.al aj