Source : Webster's Revised Unabridged Dictionary (1913)

Solipsism \So*lip"sism\, n. [L. solus alone + ipse self.]
   1. (Ethics) Egotism. --Krauth-Fleming.

   2. (Metaph.) Egoism. --Krauth-Fleming.

Source : WordNet®

solipsism
     n : (philosophy) the philosophical theory that the self is all
         that you know to exist