Lewis & Short

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păcisco, ĕre, 3, v. n. and a. [collat. form of dep. paciscor, q. v.], to agree, contract, bargain, covenant (class. only in perf. part. pass.): id quoque paciscunt, Naev. ap. Non. 474, 17: paciscit, obsides ut reddant, id. ib. 18.
Hence, pactus, a, um, in pass. signif., agreed upon, settled, determined, covenanted, stipulated (class.).

  1. A. In gen.: pactum pretium, Cic. Off. 3, 29, 107: pacta praemia, id. Q. Fr. 3, 3, 2: dies, id. Cat. 1, 9, 24: merces, Hor. C. 3, 3, 22: foedus, Cic. Sest. 14, 33: cum hoste pactae induciae, id. Off. 1, 10, 33.
    In the abl. absol.: quidam pacto inter se ut victorem res sequeretur, ferro decreverunt, by agreement, Liv. 28, 21, 5; Sil. 14, 97.
  2. B. In partic., betrothed: haec tibi pacta’st Callicli filia, Plaut. Trin. 5, 2, 59: cujus filio pacta est Artavasdis filia, Cic. Att. 5, 21, 2: alii pacta puella, Tac. A. 1, 55: Turnus, cui pacta Lavinia fuerat, Liv. 1, 2: conjux, Verg. A. 10, 722.
    Hence, as subst.
    1. 1. pacta, ae, f., a betrothed woman: gremiis abducere pactas, Verg. A. 10, 79: pacta ejus, Menelai filia, Vell. 1, 1, 3; Juv. 6, 200.
    2. 2. pactus, i, m., a betrothed husband, a man engaged or promised in marriage: proles Amissum didicere patrem, Marpissaque pactum, Stat. Th. 3, 172.
    3. 3. pactum, i, n., an agreement, covenant, contract, stipulation, compact, pact (cf.: conventio, pactio, obligatio): pactum est, quod inter aliquos convenit, Cic. Inv. 2, 22, 68; cf. Auct. Her. 2, 13, 20: pacta et promissa semperne servanda sint, Cic. Off. 3, 24, 92: mansit in condicione atque pacto, id. Verr. 1, 6, 16: pacti et conventi formula, id. Caecin. 18, 51; cf.: ex pacto et convento, id. Att. 6, 3, 1: pacta conventaque, Sen. Ben. 3, 15, 1: stare pacto, Liv. 9, 11: pactum violans, Vulg. Mal. 2, 10 et saep.
      Hence (eccl. Lat.), the covenant of God: dereliquerunt pactum Domini, Vulg. Deut. 29, 25; id. 3 Reg. 11, 11; id. 2 Par. 6, 14.
      Poet.: sacrum, i. e. a marriagecontract, Val. Fl. 8, 401; cf. Juv. 6, 25.
        1. (β) Transf., in gen., abl. pacto (like ratione and modo), manner, way, means (class.): percontat Aeneas, quo pacto Troiam urbem liquerit, Naev. Bell. Pun. 2, 1: si non fecero ei male aliquo pacto, Plaut. Bacch. 3, 6, 27; id. Am. prol. 137: nescio quo pacto semper hoc fit, how, Cic. Mur. 21, 43; id. Quint. 17: non tacebo umquam alio pacto, nisi, etc., Plaut. Rud. 5, 3, 46: aliquo pacto verba his dabo, Ter. Heaut. 4, 4, 13: quoquo pacto tacito est opus, id. Ad. 3, 2, 44: si nullo alio pacto, id. Phorm. 2, 1, 71: alio pacto docere, Cic. Inv. 1, 21, 30: fieri nullo pacto potest, ut, etc., id. Fin. 1, 8, 27; Ter. And. 1, 5, 12: servi mei si me isto pacto metuerent, Cic. Cat. 1, 7, 17; Hor. Ep. 1, 6, 10; 1, 8, 13: hoc pacto, Verg. G. 2, 248.

păciscor, pactus, 3, v. dep. n. and a. (act. collat. form, v. supra) [1. paco], to make a bargain, contract, or agreement with any one; to covenant, agree, stipulate, bargain, contract respecting any thing (cf.: transigo, stipulor, pango).

  1. I. Lit.
    1. A. In gen.
          1. (α) Neutr.: pacisci cum illo paululā pecuniā potes, Plaut. Bacch. 4, 8, 24; Cic. Verr. 2, 3, 14, § 36; Ov. M. 4, 702: paciscitur magnā mercede cum Celtiberorum principibus, ut, etc., Liv. 25, 33; cf.: pacti sunt inter se, ut die statutā, Just. 1, 10, 4; 16, 4, 7; 38, 3, 5; cf. esp. id. 3, 6, 10: votis pacisci, Ne Cypriae Tyriaeque merces Addant avaro divitias mari (= votis transigere cum dis), Hor. C. 3, 29, 59: de mercedibus, Suet. Gram. 7.
          2. (β) Act.: quae pacisci modo scis, set quod pacta’s, non scis solvere, Plaut. Ps. 1, 2, 89: argentum, id. ib. arg. 1, 9: quam (provinciam) sibi pactus erat, Cic. Sest. 25, 55: rem, Auct. Her. 2, 13, 20: pecuniam cum aliquo, Auct. B. Alex. 55: omnibus proscriptis, reditum salutemque pactus est, Vell. 2, 77, 2: ab aliquo vitam, Sall. J. 26, 1; so, pactus in singulos (homines) minas decem a tyranno, Plin. 35, 10, 36, § 99: cum Xerxe nuptias filiae, Just. 2, 15, 14.
            With object-clause: Leucippo fieri pactus uterque gener, Ov. F. 5, 702: dimitti (eum) pactus, si, etc., Plin. 8, 7, 7, § 18.
            In part. fut. pass.: ut firma fierent paciscenda, Amm. 31, 12, 13.
    2. B. In partic., of a marriage-contract, to betroth a woman (syn.: despondeo, spondeo): ex quā pactus esset vir domo, in matrimonium duceret, Liv. 4, 4, 10: Etutam pacto fratri eum invidisse, id. 44, 30, 4.
  2. II. Trop., to barter, hazard, stake (poet.): vitam pro laude, Verg. A. 5, 230: letum pro laude, id. ib. 12, 49: aevum pro luce, Stat. Th. 1, 317.

* pactor, ōris, m. [paciscor], one who makes a contract, a contractor, negotiator: societatis pactores, Cic. Verr. 2, 5, 21, § 55.

pactum, i, n., v. pacisco fin.

1. pactus, a, um, Part. and P. a., from pacisco.

2. pactus, a, um, Part., from pango.

3. pactus, i, m., v. pacisco fin.