/ ˈsɒlɪpsɪzəm; NAmE ˈsoʊl-; ˈsɑːl-/ noun
[ U ] ( philosophy ) the theory that only the self exists or can be known
► sol·ip·sis·tic / ˌsɒlɪpˈsɪstɪk; NAmE ˌsɑːl-; ˌsoʊl-/ adjective
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WORD ORIGIN
late 19th cent.: from Latin solus alone + ipse self + -ism .