From The Collaborative International Dictionary of English v.0.48 [gcide]:
2. (Biol.) The fusion of a female germ cell (ovum) with a male germ cell (in animals, a spermatozo["o]n) to form a single new cell endowed with the power of developing into a new individual; fertilization; fecundation.
Note: In the broadest biological sense, impregnation, or sexual generation, consists simply in the coalescence of two similar masses of protoplasmic matter, either derived from different parts of the same organism or from two distinct organisms. From the single mass, which results from the fusion, or coalescence, of these two masses, a new organism develops.
From WordNet (r) 3.0 (2006) [wn]:
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