Source : Webster's Revised Unabridged Dictionary (1913)

Altruistic \Al`tru*is"tic\, a. [Cf. F. altruiste, a. See
   {Altruism}..]
   Regardful of others; beneficent; unselfish; -- opposed to
   {egoistic} or {selfish}. --Bain. -- {Al`tru*is"tic*al*ly},
   adv.

Source : WordNet®

altruistically
     adv : in an altruistic manner; "he acted selflessly when he helped
           the old lady in distress" [syn: {selflessly}]