Can be confused: egoism, egotism (see synonym study at the current entry).
Synonyms 1. 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. See also pride.