sol ‧ ip ‧ sis ‧ m /ˈsɒləpsɪz ə m, ˈsɒlɪpsɪz ə m $ ˈsɑː-, ˈsoʊ-/ BrE AmE noun [uncountable] technical
[ Date: 1800-1900 ; Language: Latin ; Origin: solus ( ⇨ ↑ sole 1 ) + ipse 'self' ]
the idea in ↑ philosophy that only the ↑ self exists or can be known