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Noun: solipsism  'sow-lup,si-zum [N. Amer], 'só-lip,si-zum [Brit]
  1. (philosophy) the philosophical theory that the self is all that you know to exist
    "Solipsism posits that only one's own mind is sure to exist"

Derived forms: solipsisms

Type of: philosophical doctrine, philosophical theory

Encyclopedia: Solipsism