What is the Latin word for transaction?

The usual Latin words for “transaction” are negōtium, mercor, mercātiō. The right choice depends on the sense; see the distinctions below.

English → Latin

“transaction” in Latin

negōtiumbusiness, employment, occupation, affair; difficulty, pains, trouble, labor; matter, thing (= πρᾶγμα (prâgma))mercorto trade, deal, sell mercātiōa dealing in wares, a trading

The English word transaction itself goes back to Latin agō, through transactio.

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

transaction

res (general term): negotium (business). Mercantile transaction, negotium; mercatura; mercatio.

Quick answer

What is the Latin word for transaction?: The usual Latin words for “transaction” are negōtium, mercor, mercātiō. 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.