Lewis & Short

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con-grĕdĭor, gressus, 3, v. dep. [gradior], to go, come, or meet with one, esp. with the access. idea of intention, in a friendly or hostile sense (class. in prose and poetry); constr. with cum (contra, etc.), the acc., dat., or absol.

  1. I. In a friendly sense, to visit, accost, address, meet with.
          1. (α) With cum: insinuatus in familiaritatem adulescentis et cum eo saepe congressus, Cic. Att. 2, 24, 2: luna tum congrediens cum sole, tum digrediens, id. N. D. 2, 40, 103: perquirere ubi sit congressus cum servis Caelius, id. Cael. 22, 53: qui cum Caesare in itinere congressi … orabant, Caes. B. G. 4, 11.
          2. (β) With acc.: hunc, Plaut. Most. 3, 2, 96; id. Ep. 4. 1, 19.
          3. (γ) Absol., Plaut. Ep. 4, 1, 16; id. Curc. 2, 1, 19 al.; Ter. Phorm. 5, 6, 12; Cic. Pis. 25, 59; id. Att. 8, 15, 3; Sall. J. 109, 2; Nep. Dat. 11, 2: in eo loco ut congrederentur convenit, Liv. 32, 39, 16; 38, 25, 6; 35, 15, 2: in Macedoniā congrediemur, Brut. ap. Cic. Ep. ad Brut. 1, 6, 1: congressa primordia rerum, Lucr. 1, 761; 5, 192; 5, 427.
  2. II. In a hostile sense, to fight, contend, engage. etc. (most freq. in the historians).
          1. (α) With cum: cum hostibus, Plaut. Ps. 2, 1, 6: saepenumero cum his, Caes. B. G. 1, 39; 1, 40; 7, 65; Nep. Eum. 11, 5; id. Hann. 1, 2; Liv. 21, 16, 3.
          2. * (β) With contra: contra ipsum Caesarem est congressus armatus, Cic. Lig. 3, 9.
          3. * (γ) With adversus, Aur. Vict. Epit. 40.
          4. * (δ) With inter se, Aur. Vict. Caes. 42.
            (ε) With dat. (poet. or in post-Aug. prose): infelix puer atque impar congressus Achilli, Verg. A. 1, 475; Ov. M. 12, 76; Sen. Agam. 747: quippe armato congredi nudum dementia videbatur, Curt. 9, 7, 21; Aur. Vict. Caes. 39.
            (ζ) Absol.: locus ad insidias ille, ubi congressi sunt, utri fuerit aptior, Cic. Mil. 20, 53: Aedui quoniam armis congressi ac superati essent, Caes. B. G. 1, 36; so id. ib. fin.; Nep. Dat. 8, 1; id. Ages. 3 fin.; Liv. 7, 22, 4; 8, 24, 9; Tac. A. 2, 11; 12, 54; Quint. 8, 3, 63; Verg. A. 12, 465; Curt. 9, 5, 14: totis viribus, id. 6, 1, 10: in congrediendis hostibus, Gell. 1, 11, 2 (cf. id. § 9: in congressibus proeliorum).
    1. B. Transf., of contention in words, specif. of judic. strife (almost confined to Cic. and Quint.): tecum luctari et congredi, Cic. Sull. 16, 47; so id. Mur. 32, 67: cum Academico et eodem rhetore, id. N. D. 2, 1, 1; Dig. 38, 9, 1 pr.; Cod. 7, 56, 3.
          1. (β) With abstract subjects: quasi ad repugnandum congressa defensio, Cic. Top. 25, 93; cf. Quint. 3, 6, 13: oratio aequo congressa campo, id. 12, 9, 2.

2. congressus, ūs, m. [congredior], a coming or going together, in a friendly or hostile manner (class. in prose and poetry).

  1. I. A friendly meeting, a social assembly, conference, conversation, etc.: omnes congressum tuum fugiunt, Cic. Sest. 52, 111; id. Phil. 12, 11, 26; id. Att. 1, 17, 2: si quis congressus fuerit mihi cum Caesare, id. ib. 11, 12, 3; id. Cael. 8, 20; Liv. 7, 4, 4; Quint. 1, 2, 20; Tac. A. 13, 46 et saep.
    In plur., Cic. Or. 10, 33; id. Lael. 23, 87; Liv. 1, 19, 5; 7, 40, 3; Tac. A. 2, 28; Verg. A. 5, 733 al.
    Also of the companionship of animals, Cic. N. D. 2, 48, 124; Quint. 1, 2, 20.
    1. B. Pregn., a close union, combination (very rare): materiaï, Lucr. 5, 68; cf.: duriorum (consonantium) inter se, Quint. 11, 3, 35.
      In plur., Lucr. 2, 1065.
      Hence, carnal union, copulation: feminarum, Plin. 12, 14, 30, § 54; cf. congressio, I. B.
  2. II. A hostile encounter, a contest, fight, Cic. de Or. 2, 78, 317: cum his navibus nostrae classi ejusmodi congressus erat, ut, etc., Caes. B. G. 3, 13; id. B. C. 1, 46: magnam cladem in congressu facere, Sall. J. 59, 3; 74, 3; Tac. A. 2, 3; Verg. A. 12, 514; Val. Fl. 6, 322 al.
    Also of judicial contests, Quint. 3, 6, 4.