Lewis & Short

prō-lŭbĭum, ĭi, n. [lubet].

  1. I. Subject., will, desire, inclination (ante- and post-class.): muliebre ingenium, prolubium, occasio, Att. ap. Non. 64, 8; Novat. and Laber. ib. 10 and 12; Ter. Ad. 5, 9, 28; Gell. 16, 19, 12.
  2. II. Object., pleasure (postclass.): majus, Gell. 5, 10, 12: libidinis, App. M. 10, p. 249, 4.