Lewis Short
(adjective) : scālāris, e, id.
* Of or belonging to a flight of steps or a ladder: forma,Vitr. 5, 6 fin.; STRVCTIO,Inscr. Orell. 4570.—As subst.: scālārĭa, ĭum, n., a flight of stairs or steps, a staircase, Vitr. 5, 6, 3; also in the sing.: SCALARE, is,Inscr. Orell. 4750.
Charlton T. Lewis, Charles Short, A Latin Dictionary