Synonyms for Fecundation (same or very similar meaning)
WordNet sense 1 (creation by the physical union of male and female gametes; of sperm and ova in an animal or pollen and ovule in a plant):
fertilization, impregnation, fertilisation
WordNet sense 2 (making fertile as by applying fertilizer or manure):
dressing
From the ODE community, based on WordNet
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