Lewis & Short

con-grĕgo, āvi, ātum, 1, v. a., to collect into a flock or herd, to assemble.

  1. I. Prop. (rare; mostly in Pliny the elder): oves, Plin. 8, 47, 72, § 188.
    Mid.: apium examina congregantur, collect in swarms, Cic. Off. 1, 44, 157; cf. id. N. D. 2, 48, 124: cetera animantia congregari videmus, Plin. 7, prooem. 1, § 5: cum ceteris, id. 8, 22, 34, § 81: in loca certa, id. 10, 23, 31, § 61: se ad amnes (ferae), id. 8, 16, 17, § 42.
    More freq. (in good prose; esp. freq. in Cic.),
  2. II. In gen., to collect or assemble a multitude together, to unite, join, associate.
    1. A. Lit.: dissipatos homines, Cic. Tusc. 1, 25, 62; cf.: dispersos homines in unum locum, id. de Or. 1, 8, 33: se unum in locum ad curiam, id. Phil. 14, 6, 15: dissipatos (homines) unum in locum, id. Sest. 42, 91: multitudinem fugitivorum unum in locum, id. Par. 4, 1, 27; Tac. A. 1, 28 fin.: hominem in idem Vettii indicium atque in eundem hunc numerum, Cic. Vatin. 10, 25.
      With cum: se cum aequalibus, Cic. Fin. 5, 15, 42; id. Quint. 16, 52; id. Rab. Perd. 7, 21 fin.
      With dat.: cum illis moror quibus me tempus aliquod congregavit, Sen. Ep. 62, 2.
      Absol.: deterrimum quemque, Tac. A. 1, 16 fin.
      Mid.: secedant improbi, unum in locum congregentur, Cic. Cat. 1, 13, 32: in fano congregantur commentandi causā, id. Div. 1, 41, 90: in Academiā congregati, id. Ac. 1, 9, 34: armati locis patentibus congregantur, Liv. 24, 21, 9: congregabantur undique ad Titum Tatium, id. 1, 10, 1: quanta vis oriens et congregata, Cic. Dom. 25, 67: Gamphasantes nulli externo congregantur, Plin. 5, 8, 8, § 45: ciconiae abiturae congregantur in certo loco, id. 10, 23, 31, § 61: cuncti deinde ad portum congregantur, Just. 19, 2, 10: inter se, Tac. A. 1, 30: in urbe, id. H. 3, 82.
      And in tmesis: conque gregantur, Lucr. 6, 456.
      Prov.: pares cum paribus facillime congregantur, Cic. Sen. 3, 7.
    2. B. Trop. (rare; mostly in Quint.), to collect, accumulate: argumenta infirmiora, Quint. 5, 12, 4: verba, id. 9, 3, 45; cf. turbam (verborum), id. 10, 1, 7; cf. congregatio, II.