solipsism
so·lip·sism
noun
1.
(philosophy) the philosophical theory that the self is all that you know to exist
Origin
From Latin sōlus (“alone”) + ipse (“self”) + -ism.
Related words
Broader terms
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.