A philosophical or psychological system based on the principle that the individual self is the center of all reality, or the practice of excessive self-interest in decision-making.
From ego plus -mism (a suffix denoting a system of thought or behavior). This term emerged in philosophy to describe worldviews centered entirely on the self as the primary reality.
Egomism is the philosophical version of egomania—it's not just acting self-centered, it's a whole belief system that says 'the self is everything,' which connects to solipsism and makes it sound almost academic.
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