The Collaborative International Dictionary of English v.0.48:

Impregnate \Im*preg"nate\ ([i^]m*pr[e^]g"n[=a]t), v. t. [imp. &
   p. p. Impregnated (-n[asl]*t[e^]d); p. pr. & vb. n.
   Impregnating (-n[asl]*t[i^]ng).] [LL. impraegnatus, p. p.
   of impraegnare to impregnate, fr. L. pref. im- in + praegnans
   pregnant. See Pregnant.]
   1. To make pregnant; to cause to conceive; to render
      prolific; to get with child or young.
      [1913 Webster]

   2. (Biol.) To come into contact with (an ovum or egg) so as
      to cause impregnation; to fertilize; to fecundate.
      [1913 Webster]

   3. To infuse an active principle into; to render fruitful or
      fertile in any way; to fertilize; to imbue.
      [1913 Webster]

   4. To infuse particles of another substance into; to
      communicate the quality of another to; to cause to be
      filled, imbued, mixed, or furnished (with something); as,
      to impregnate India rubber with sulphur; clothing
      impregnated with contagion; rock impregnated with ore.
      [1913 Webster]