a. [ L. perpendicularis, perpendicularius: cf. F. perpendiculaire. See Perpendicle, Pension. ]
Perpendicular style (Arch.),
n.
n. [ Cf. F. perpendicularité. ] The quality or state of being perpendicular. [ 1913 Webster ]
adv. In a perpendicular manner; vertically. [ 1913 Webster ]