solipsism Meaning, Definition & Usage

  1. noun (philosophy) the philosophical theory that the self is all that you know to exist

WordNet

So*lip"sism noun
Etymology
L. solus alone + ipse self.
Definitions
  1. (Ethics) Egotism. Krauth-Fleming.
  2. (Metaph.) Egoism. Krauth-Fleming.

Webster 1913