perpendicularitysubstantiv The state or condition of being at an angle of 90 degrees to a given line, plane, or surface. The perpendicularity of the walls ensured that the building was structurally sound.
The quality of being upright or vertical. The perpendicularity of the tower was impressive, standing tall against the skyline.
A measure of how closely two lines or surfaces approach a true right angle; the extent of deviation from perpendicular position. The inspector measured the perpendicularity of the flange to verify it was within specification.