Solipsism is the philosophical theory or idea that the self is the only thing the existance of which can be known. In simple terms, it is only possible to be certain of one’s minds existence, and nothing outside of it.
The word solipsism is the combination of the Latin words solus (meaning ‘alone’), and ipse (meaning ‘self’).
It is also described as hyper-selfishness or extreme egocentrism.
René Descartes is credited with introducing solipsism into the lexicon, but there is evidence that it may have originated from the work of a French satirist named Giulio Clemente Scotti in 1652.