Solipsisms [noun]
Definition of Solipsisms:
theory that only the self exists
Sentence/Example of Solipsisms:
The philosophic system becomes a solipsism, a pure lyric expression of the appetites of human nature.
This theory is also called Subjective Idealism or Solipsism.
I realize now that I may have been falling into the trap of solipsism, “who watches the quad,” et cetera, type of thing.
Thus idealists are wedded to solipsism irrevocably; and it is a happy marriage, only the name of the lady has to be changed.