The Collaborative International Dictionary of English v.0.48:

Fecundate \Fec"un*date\, v. t. [imp. & p. p. Fecundated; p.
   pr. & vb. n. Fecundating.] [L. fecundare, fr. fecundus. See
   Fecund.]
   1. To make fruitful or prolific. --W. Montagu.
      [1913 Webster]

   2. (Biol.) To render fruitful or prolific; to impregnate; as,
      in flowers the pollen fecundates the ovum through the
      stigma.
      [1913 Webster]

WordNet (r) 3.0 (2006):

fecundate
    v 1: make fertile or productive; "The course fertilized her
         imagination" [syn: fertilize, fecundate, fertilise]
    2: introduce semen into (a female) [syn: inseminate,
       fecundate, fertilize, fertilise]

Moby Thesaurus II by Grady Ward, 1.0:

20 Moby Thesaurus words for "fecundate":
   cross-fertilize, cross-pollen, cross-pollinate, cross-pollinize,
   dress, enrich, fatten, fecundify, fertilize, fructify,
   get with child, get with young, impregnate, inseminate, manure,
   pollen, pollinate, pollinize, prolificate, spermatize