Lewis & Short

sexĭes or -ĭens, num. adv. [sex].

  1. I. Six times: hostis sexies victus, Liv. 4, 32: id sexies evenit per annos, Plin. 18, 16, 43, § 146: hoc sexies ducendum est, is to be taken six times, to be multiplied by six, Col. 5, 2 fin.
  2. * II. For sextum, for the sixth time: Mario sexies Valerioque Flacco Coss., Vell. 1, 15, 5.