Lewis & Short

ūsŭālis, e, adj. [2. usus].

  1. I. That is for use, fit for use (post-class.): mancipia, Dig. 39, 4, 16, § 3.
  2. * II. Usual, common, ordinary: sermo, Sid. Ep. 4, 10; Ambros. in Luc. 7, n. 150.
    Hence, adv.: ūsŭālĭter, in the usual manner (late Lat.), Cassiod. Var. 2, 39.