fertilization
US /ˌfɝː.t̬əl.əˈzeɪ.ʃən/
UK /ˌfɝː.t̬əl.əˈzeɪ.ʃən/

1.
the action or process of fertilizing an egg, female animal, or plant, involving the fusion of male and female gametes to form a zygote
:
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Successful fertilization is crucial for plant reproduction.
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In vitro fertilization (IVF) is a common fertility treatment.
2.
the application of fertilizer to soil
:
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The farmer applied a new method of soil fertilization.
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Proper fertilization is essential for healthy crop growth.