Lewis & Short

quinquennālis, e, adj. [quinquennis].

  1. I. That takes place every fifth year, quinquennial: quinquennalis celebritas ludorum, Cic. de Or. 3, 32, 127: certamen, Suet. Ner. 12: ludicrum, Tac. A. 14, 20: vota, Liv. 31, 9: agon, Vulg. 2 Macc. 4, 18.
    1. B. Subst.: quinquennālĭa, ĭum, n., games celebrated every fifth year: NERONIS, Inscr. Grut. 116, 3.
  2. II. Continuing five years, quinquennial: censura, Liv. 4, 24: magistratus quinquennalis, the office of a quinquennal, App. M. 10, p. 247, 25; cf. quinquennalitas.
    1. B. Subst.: quinquennā-lis, is, m., a magistrate in the municipal towns who held his office five years, a quinquennal, Spart. Hadr. 19: decurionum quinquennales, App. M. 11, p. 273; cf. Spart. Hadr. 19; Cod. Th. 13, 3, 1.

quinquennis, e, adj. [quinqueannus], of five years or five years old: filia, Plaut. Poen. prol. 85: Olympias, celebrated every fifth year, quinquennial, Ov. P. 4, 6, 5: vinum, Hor. S. 2, 8, 47: oleae, id. ib. 2, 2, 57: juvenis, Col. 7, 3, 6.
Plur. as subst.: quinquennĭa, ōrum, n., for quinquennālĭa, ium, games celebrated every fifth year, Stat. S. 5, 3, 113.