For information about the ADA, including the revised 2010 ADA regulations, please visit the Department's website www.ADA.gov; or, for answers to specific questions, call the toll-free ADA Information Line at 800-514-0301 (Voice) or 800-514-0383 (TTY).
Definition of altruism. 1  1 : unselfish regard for or devotion to the welfare of others charitable acts motivated purely by altruism. 2  2 : behavior by an animal that is not beneficial to or may be harmful to itself but that benefits others of its species.
Altruism is generally understood to be behavior that. beneÃts others at a personal cost to the behaving indi-. vidual. However, within evolutionary biology, dif ferent. authors have interpreted the concept of altruism dif-. ferently, leading to dissimilar predictions about the. evolution of altruistic behavior.