WordNet (r) 3.0 (2006):

fertilisation
    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]