acclīvĭtas, ātis, f. [acclivis],
an ascending direction , an acclivity , ascent : pari acclivitate collis, Caes. B. G. 2, 18; so Col. 2, 4, 10.—Concr. of the rising place itself, Amm. 14, 2, 13.
acclīvitās ātis, f acclivis, an ascent, rising grade, acclivity : pari acclivitate collis, Cs. ...
An Elementary Latin Dictionary