The Collaborative International Dictionary of English v.0.48:

Implantation \Im`plan*ta"tion\, n. [Cf. F. implantation.]
   The act or process of implanting.
   [1913 Webster]

WordNet (r) 3.0 (2006):

implantation
    n 1: (embryology) the organic process whereby a fertilized egg
         becomes implanted in the lining of the uterus of placental
         mammals [syn: implantation, nidation]
    2: the act of planting or setting in the ground
    3: a surgical procedure that places something in the human body;
       "the implantation of radioactive pellets in the prostate
       gland"