Lewis & Short

trĕcēni (tercēni, Eum. Rest. Schol. 11), ae, a (gen. plur. trecenorum, Liv. 7, 25: trecenūm, Sen. Q. N. 3, 7, 3), num. distr. adj. [tres-centum].

  1. I. Lit., three hundred each, three hundred distributively: treceni equites in singulis legionibus, Liv. 39, 38, 11; 8, 8, 14: familiae in singulas colonias, id. 32, 29, 4: nummi in capita Romana, id. 22, 52, 3.
    Of an indefinitely large number: non si trecenis, quotquot eunt dies, Amice, places illacrimabilem Plutona tauris, Hor. C. 2, 14, 5.
  2. II. Transf., in gen., three hundred: vivere ducenis annis et quosdam trecenis, Plin. 8, 10, 10, § 28.