Lewis Short
(adjective) : perpĕtŭārĭus, a, um, id.
* Constant, permanent; always employed, constantly engaged in any business or calling (post-Aug.): mulio,Sen. Apoc. 6, 2.—Subst.: perpĕtŭārĭus, ii, m., a fee-farmer, hereditary tenant, Cod. Just. 11, 70, 5.
Charlton T. Lewis, Charles Short, A Latin Dictionary