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“fornication” in Latin

The English word fornication itself goes back to Latin fornix, through fornicātiō.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

fornication
stuprum. To be given to fornication, lubidinibus indulgere; rebus venereis deditum esse: to commit fornication, stupra facere; scortari (with a prostitute): with anybody, stuprum facere cum, etc. (if only once); stupra facere cum, etc.; stupri consuetudinem facere cum, etc. (if repeatedly; the last, Suet., Cal., 24).
Scripturally, it stands also for idolatry, Vid. FORSAKE, Vid: To DESERT.

Quick answer

What is the Latin word for fornication?
The usual Latin words for “fornication” are stuprum, scortor. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.