Source : Webster's Revised Unabridged Dictionary (1913)

Self-sacrifice \Self`-sac"ri*fice\, n.
   The act of sacrificing one's self, or one's interest, for
   others; self-devotion.

Source : WordNet®

self-sacrifice
     n : acting with less concern for yourself than for the success
         of the joint activity [syn: {selflessness}]