confutation

from WordNet (r) 3.0 (2006)

confutation
    n 1: the speech act of refuting conclusively
    2: evidence that refutes conclusively

from The Collaborative International Dictionary of English v.0.48

Confutation \Con`fu*ta"tion\, n. [L. confutatio: cf. F.
   confutation.]
   The act or process of confuting; refutation. "For the
   edification of some and the confutation of others." --Bp.
   Horne.
   [1913 Webster]