invalidation

from WordNet (r) 3.0 (2006)

invalidation
    n 1: (law) a formal termination (of a relationship or a judicial
         proceeding etc) [syn: {annulment}, {invalidation}]

from The Collaborative International Dictionary of English v.0.48

Invalidation \In*val`i*da"tion\, n.
   The act of inavlidating, or the state of being invalidated.
   [1913 Webster]

         So many invalidations of their right.    --Burke.
   [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

51 Moby Thesaurus words for "invalidation":
      abolishment, abolition, abrogation, annulment, cancel, canceling,
      cancellation, cassation, counterbalancing, countermand,
      counterorder, defeasance, disconfirmation, disproof, disproval,
      disproving, explosion, expose, exposure, frustration, negation,
      neutralization, nullification, offsetting, recall, recantation,
      redargution, reductio ad absurdum, renege, repeal, rescinding,
      rescindment, rescission, retraction, reversal, revocation, revoke,
      revokement, setting aside, suspension, thwarting, undoing,
      vacation, vacatur, vitiation, voidance, voiding, waiver, waiving,
      withdrawal, write-off