This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. alternative spelling of fertilization

n. creation by the physical union of male and female gametes; of sperm and ova in an animal or pollen and ovule in a plant

n. making fertile as by applying fertilizer or manure

"Because human beings only ever have sex when fertilisation is most optimal."

fertilization   

anthers    anther    fertilization    cross-fertilisation    instauration    ovule    snow-blindness    propolis    constitutionalism    labellum