fertilization
noun /ˌfɜːtəlaɪˈzeɪʃn/
  /ˌfɜːrtələˈzeɪʃn/
(British English also fertilisation)
 [uncountable]- the process of fertilizing a plant or egg; the process of a plant or egg becoming fertilized
- Immediately after fertilization, the cells of the egg divide.
 
 - fertilization (of something) (with something) the act of adding a substance to soil to make plants grow more successfully
- the fertilization of soil with artificial chemicals