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From The Collaborative International Dictionary of English v.0.48:
Egoism \E"go*ism\, n. [F. ['e]go["i]sme, fr. L. -ego I. See I, and cf. Egotism.] 1. (Philos.) The doctrine of certain extreme adherents or disciples of Descartes and Johann Gottlieb Fichte, which finds all the elements of knowledge in the ego and the relations which it implies or provides for. [1913 Webster] 2. Excessive love and thought of self; the habit of regarding one's self as the center of every interest; selfishness; -- opposed to altruism. [1913 Webster]