I.a flat or even surface, level ground, a plain (class.): “aequata agri planities,” Cic. Verr. 2, 4, 48, § 107: “erat inter oppidum et collem planitia,” Caes. B. C. 1, 43: “planities erat inter sinistros montes,” Sall. C. 59, 2; id. J. 48 fin.: “speculi,” Lucr. 4, 294: “propter planitiem regionum,” Cic. Div. 1 1: pars planitiae, Liv. 44, 6; Vitr. 7, 3: “CLIVOM MARTIS IN PLANICIEM REDEGERVNT S. P. Q. R.,” Inscr. Grut. 152, 6; “a similar inscription with the form PLANITIAM,” Inscr. Grut. 152, 7: nulla planitia dividit, Auct. B. Hisp. 28 fin.: “planitiae coronarum,” Vitr. 7, 3.
plānĭtĭes , ēi (collat. form plānĭtĭa , ae, very rare; Cic. Div. 1, 1, 2; Caes. B. C. 1, 43), and plur. planitiae, f. id.,