/ ˈfɔːnɪkeɪt; NAmE ˈfɔːrn-/ verb
[ v ] ( formal , disapproving ) to have sex with sb that you are not married to
► for·ni·ca·tion / ˌfɔːnɪˈkeɪʃn; NAmE ˌfɔːrn-/ noun [ U ]
► for·ni·ca·tor noun
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WORD ORIGIN
Middle English (as fornication ): from ecclesiastical Latin fornicat- arched, from fornicari , from Latin fornix , fornic- vaulted chamber, later brothel.