The Collaborative International Dictionary of English v.0.48:
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. [1913 Webster]WordNet (r) 3.0 (2006):
altruistically adv 1: in an altruistic manner; "he acted selflessly when he helped the old lady in distress" [syn: altruistically, selflessly]