Philosophical Idea That Only One's Mind Exists

This page is the CodyCross answer for the clue below from Street Fair, Group 1307, Puzzle 5 (Celebrity Guests).

Question is: Philosophical Idea That Only One's Mind Exists

and the answer is: SOLIPSISM

Word Meaning:

SOLIPSISM — (philosophy) The idea that the self is all that exists or that can be proven to exist.

Definitions from Wiktionary.