The Collaborative International Dictionary of English v.0.48:

Selfless \Self"less\, a.
   Having no regard to self; unselfish.
   [1913 Webster]

         Lo now, what hearts have men! they never mount
         As high as woman in her selfless mood.   --Tennyson.
   [1913 Webster]

WordNet (r) 3.0 (2006):

selfless
    adj 1: showing unselfish concern for the welfare of others [syn:
           altruistic, selfless] [ant: egocentric, egoistic,
           egoistical, self-centered, self-centred]