The Collaborative International Dictionary of English v.0.48:

Fecundation \Fec`un*da"tion\, n. [Cf. F. f['e]condation.]
   (Biol.)
   The act by which, either in animals or plants, material
   prepared by the generative organs the female organism is
   brought in contact with matter from the organs of the male,
   so that a new organism results; impregnation; fertilization.
   [1913 Webster]

WordNet (r) 3.0 (2006):

fecundation
    n 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 [syn: fertilization, fertilisation,
         fecundation, impregnation]
    2: making fertile as by applying fertilizer or manure [syn:
       fertilization, fertilisation, fecundation, dressing]