The Collaborative International Dictionary of English v.0.48:

Renouncement \Re*nounce"ment\ (-ment), n. [Cf. F. renoncement.]
   The act of disclaiming or rejecting; renunciation. --Shak.
   [1913 Webster]

WordNet (r) 3.0 (2006):

renouncement
    n 1: an act (spoken or written) declaring that something is
         surrendered or disowned [syn: renunciation,
         renouncement]