Lewis & Short

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ĕquester, tris, tre (m. equestris, Liv. 27, 1, 11; Verg. A. 5, 667 al.; v. Zumpt, Gram. § 100, A. 1.; like acris, celebris, celeris, etc.), adj. [eques], belonging to a horseman, equestrian.

  1. I. In gen. (very rare): equestres statuae inauratae, Cic. Verr. 2, 2, 61; id. Phil. 6, 5; 9, 6; Suet. Tit. 2: equi, riding-horses, Vulg. 3 Reg. 4, 26.
    Far more freq.,
  2. II. In partic.
    1. A. Of or belonging to cavalry: proelium, Caes. B. G. 1, 18 fin.; 1, 48, 4; 2, 8, 2 et saep. (cf.: equestris pugna, Cic. Verr. 2, 4, 55): tumultus, Liv. 27, 1, 11: terror, id. 27, 42: procella, id. 10, 5: copiae (opp. pedestres), Cic. Fin. 2, 34, 112: arma, Liv. 35, 23; cf. scuta, id. 43, 6: militia, Suet. Claud. 25 et saep. So as an epithet of Fortuna, Liv. 40, 40.
    2. B. Belonging to the order of knights, equestrian: ordo, Cic. Planc. 35, 87; Suet. Aug. 100 et saep.; cf.: equestri loco natus, ortus, etc., Cic. Rep. 1, 6; id. Agr. 1, 9 fin.: equestri genere natus, Vell. 2, 88: census, Cic. Q. Fr. 1, 2, 2, § 6; Liv. 5, 7; Suet. Caes. 33; Hor. A. P. 383: anulus (i. e. aureus, a privilege of the equestrian order), Hor. S. 2, 7, 53; cf. Plin. 33, 1, 8, § 32: statuae, id. 34, 5, 10, § 19 sq.: dignitas, Nep. Att. 1; Suet. Claud. 24: familia, id. Caes. 1 et saep.
      1. 2. Subst.
        1. a. equester = eques, Tac. A. 12, 60; 13, 10 fin.
          Plur.:           apud equestres, id. ib. 12, 60.
        2. b. equestria, ium, n. (sc. loca), the seats of the knights in the theatre, Petr. 126, 10; Sen. Ben. 7, 12; Suet. Calig. 26.