The Collaborative International Dictionary of English v.0.48:

Eradication \E*rad`i*ca"tion\, n. [L. eradicatio: cf. F.
   ['e]radication.]
   1. The act of plucking up by the roots; a rooting out;
      extirpation; utter destruction.
      [1913 Webster]

   2. The state of being plucked up by the roots.
      [1913 Webster]

WordNet (r) 3.0 (2006):

eradication
    n 1: the complete destruction of every trace of something [syn:
         eradication, obliteration]