The Collaborative International Dictionary of English v.0.48:

Subversion \Sub*ver"sion\, n. [L. subversio: cf. F. subversion.
   See Subvert.]
   The act of overturning, or the state of being overturned;
   entire overthrow; an overthrow from the foundation; utter
   ruin; destruction; as, the subversion of a government; the
   subversion of despotic power; the subversion of the
   constitution.
   [1913 Webster]

         The subversion [by a storm] of woods and timber . . .
         through my whole estate.                 --Evelyn.
   [1913 Webster]

         Laws have been often abused to the oppression and
         subversion of that order they were intended to
         preserve.                                --Rogers.
   [1913 Webster]

WordNet (r) 3.0 (2006):

subversion
    n 1: destroying someone's (or some group's) honesty or loyalty;
         undermining moral integrity; "corruption of a minor"; "the
         big city's subversion of rural innocence" [syn:
         corruption, subversion]
    2: the act of subverting; as overthrowing or destroying a
       legally constituted government [syn: subversion,
       subversive activity]