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]

Moby Thesaurus II by Grady Ward, 1.0:

73 Moby Thesaurus words for "subversion":
   alienation, answer, bloodless revolution, bouleversement,
   brainwashing, breakdown, breakup, capsizal, capsize, cataclysm,
   catastrophe, clean slate, clean sweep, complete answer,
   computer revolution, confounding, confutation, contradiction,
   controversion, convulsion, corruption, counterindoctrination,
   counterrevolution, culbute, debacle, demolishing, demolition,
   denial, destroying, destruction, discrediting, displacement,
   downfall, effective rejoinder, fall, indoctrination, overset,
   overthrow, overthrowal, overturn, palace revolution, prostration,
   radical change, rebuttal, refutal, refutation, reindoctrination,
   revolt, revolution, revolutionary war, revulsion, ruin, sabotage,
   somersault, somerset, spasm, spill, squelch, striking alteration,
   sweeping change, tabula rasa, technological revolution,
   total change, transilience, turnover, undermining, upheaval, upset,
   upsetting, upturn, violent change, wreckage, wrecking