Lewis & Short

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quăterni, ae, a (gen. plur. quaternūm, Liv. 6, 22, 7; Col. 5, 5, 2; Plin. 9, 3, 2, § 4), adj. plur. [quattuor].

  1. I. Four each, by fours, four at a time: quaternos denarios in singulas vini amphoras exegisse, Cic. Font. 5, 9: primam aciem quaternae cohortes ex V. legionibus tenebant, i. e. four from each legion, Caes. B. C. 1, 83: saepe tribus lectis videas cenare quaternos, Hor. S. 1, 4, 86.
  2. II. Four together, four at once: propter bis quaternas causas, Varr. L. L. 5, 1, 6; Aus. ldyll. 10, 60; Sedul. 2, 175; Plin. 28, 6, 17, § 64.