Lewis & Short

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com-mercĭum (con-m-; ante-class.; sometimes ‡ commircĭum; cf. Vel. Long. p. 2236 P.), ii, n. [merx].

  1. I. Commercial intercourse, trade, traffic, commerce: mare magnum et ignara lingua commercia prohibebant, Sall. J. 18, 5; Plin. 33, 1, 3, § 7; Plin. Pan. 29; Tac. Agr. 24; Liv. 4, 52, 6: salis, id. 45, 29, 13: commercium hominum in locum aliquem mutui usus contrahunt, id. 38, 18, 12: neque Thraces commercio faciles erunt, id. 40, 58, 1: jus commercii, Dig. 49, 5, 6.
    1. B. Meton.
      1. 1. The right to trade as merchants, a mercantile right: commercium in eo agro nemini est, Cic. Verr. 2, 3, 40, § 93; cf. id. ib. 2, 2, 50, § 124: L. Crasso commercium istarum rerum cum Graecis hominibus non fuisse, id. ib. 2, 4, 59, § 133: ceteris Latinis populis conubia commerciaque et concilia inter se ademerunt, Liv. 8, 14, 10; 43, 5, 9; cf. Dig. 41, 1, 62; 30, 1, 39; 45, 1, 34.
      2. * 2. An article of traffic, merchandise, wares: commercia militaria, Plin. 35, 13, 47, § 168; for provisions, id. 26, 4, 9, § 18; cf. Front. 2, 5, 14.
      3. 3. A place of trade, market-place: commercia et litora peragrare, Plin. 37, 3, 11, § 45; Claud. in Eutr. 1, 58.
  2. II. In gen., intercourse, communication, correspondence, fellowship; lit. and trop.: quid tibi mecum est commerci, senex? Plaut. Aul. 4, 4, 4; id. Bacch. 1, 2, 9; id. Stich. 4, 1, 15: mihi cum vostris legibus Nihil est commerci, I have nothing to do with your laws, id. Rud. 3, 4, 20: commercium habere cum Musis, Cic. Tusc. 5, 23, 66: commercium habere cum virtute, id. Sen. 12, 42: dandi et excipiendi beneficii, Val. Max. 5, 3, ext. 3: agrorum aedificiorumque inter se, Liv. 45, 29, 10: plebis, with them, id. 5, 3, 8; 41, 24, 16: linguae, Ov. Tr. 5, 10, 35; Liv. 1, 18, 3; 9, 36, 6; 25, 33, 3: sermonis, id. 5, 15, 5; cf.: loquendi audiendique, Tac. Agr. 2 fin.: commercia epistularum, Vell. 2, 65, 1: hoc inter nos epistularum commercium frequentare, Sen. Ep. 38, 1: communium studiorum, Suet. Claud. 42: sortis humanae, Tac. A. 6, 19: belli, stipulation, treaty, id. ib. 14, 33: belli tollere, Verg. A. 10, 532; so, belli dirimere, Tac. H. 3, 81.
    Plur.: est deus in nobis, et sunt commercia caeli, Ov. A. A. 3, 549.
    1. B. Esp., forbidden intercourse, illicit commerce: libidinis, Val. Max. 8, 2, 2: stupri, Suet. Calig. 36.
      Absol.: cum eā mihi fuit commercium, Plaut. Truc. 1, 1, 77.
      1. 2. In law, = collusio, Cod. Th. 3, 11, 4; cf. ib. 11, 4, 1 al.