Egoism: a philosophical doctrine that morality has its foundations in self-interest.
Egotism: an excessive preoccupation with self.
Note: Egotism, egoism refer to preoccupation with one's ego or self. Egotism is the common word for obtrusive and excessive reference to and emphasis upon oneself and one's own importance: His egotism alienated all his friends. Egoism, a less common word, is used especially in philosophy, ethics, or metaphysics, where it emphasizes the importance of or preoccupation with self in relation to other things: sufficient egoism to understand one's central place in the universe.
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