köken: Etymology tree Proto-Indo-European *h₁én Proto-Italic *en Proto-Italic *en- Latin in- Latin lūdō Latin illūdō Proto-Indo-European *-tis Proto-Indo-European *-Hō Proto-Indo-European *-tiHō Proto-Italic *-tiō Latin -tiō Latin illūsiōlbor. Polish iluzja Learned borrowing from Latin illūsiō.