Source : Webster's Revised Unabridged Dictionary (1913)

Self-abnegation \Self`-ab`ne*ga"tion\, n.
   Self-denial; self-renunciation; self-sacrifice.

Source : WordNet®

self-abnegation
     n : renunciation of your own interests in favor of the interests
         of others [syn: {abnegation}, {denial}, {self-denial}, {self-renunciation}]