(a.) Yielding up one's own interest, feelings, etc; sacrificing one's self.

altruistic committed consecrated dedicated devoted disinterested humble modest sacrificing self-abasing self-abnegating self-abnegatory self-denying self-devoted self-effacing self-forgetful self-immolating self-neglectful self-neglecting self-renouncing self-unconscious selfless unacquisitive unpossessive unpretentious unselfish unsparing of self