The Collaborative International Dictionary of English v.0.48:

Abnegation \Ab`ne*ga"tion\, n. [L. abnegatio: cf. F.
   abn['e]gation.]
   a denial; a renunciation.
   [1913 Webster]

         With abnegation of God, of his honor, and of religion,
         they may retain the friendship of the court. --Knox.
   [1913 Webster]

WordNet (r) 3.0 (2006):

abnegation
    n 1: the denial and rejection of a doctrine or belief;
         "abnegation of the Holy Trinity"
    2: renunciation of your own interests in favor of the interests
       of others [syn: abnegation, self-abnegation, denial,
       self-denial, self-renunciation]