LATIN DICTIONARYLexicon Latīnum
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“dealing” in Latin

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

dealing
Intercourse, commercium (PROP. for trade, then also of connection generally): negotia, plur. (business): conversatio (familiar intercourse in daily life): usus (intercourse with a person from which one derives benefit): consuetudo (habits of intercourse or intimacy): convictus (as far as one, more or less, lives with another). To have dealings with anybody, commercium habere cum aliquo; commercio alicujus frui; est mihi commercium or consuetudo cum aliquo: to break off all dealings with anybody, consuetudinem intermittere: to order one’s slaves to have no dealings with strangers, servis vetare quidquam rei cum alienis hominibus esse: to have no dealings with, commercium cum aliquo non est; in anything, alicujus rei; cum aliquo or aliqua re commerci nihil est (Plaut.).
Treatment, tractatio (e.g., of questions, affairs, etc., rerum, quaestionum): *rei tractandae modus: (agendi) ratio: agendi modus. Harsh dealing, severitas (opposed to indulgentia). Gentle dealing, lenitas. To be harsh in one’s dealings with anybody, severitatem adhibere alicui, or in aliquem: to be too indulgent in one’s dealings with anybody, aliquem nimia indulgentia tractare.
Behavior; plain or upright dealing, fides: integritas et fides: probitas: Double-dealing, faliacia: doli atque lallaciae: To be guilty of double-dealing in anything, fallaciam in re facere; toward anybody, fraudem alicui facere: dolum alicui struere, nectere, confingere: there is some double-dealing, aliquid doli subest: there is no double-dealing, nihil doli subest.
At cards, *paginarum dispertitio: careful dealing, *paginarum studiosa dispertitio (so as to avoid a misdeal).

Quick answer

What is the Latin word for dealing?
The usual Latin words for “dealing” are commercium, negōtium, conversātiō; also ūtor, cōnsuētūdō, convincō. 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.