1) Azimuth circle 2) Erectness 3) Normal 4) Perpendicularity 5) Position 6) Right angle 7) Spatial relation 8) Uprightness 9) Verticalness 1) Perpendicularity 2) Verticalness 
• (n.) The quality or state of being vertical; verticalness.
(from the article `illusion`) In studies of visual verticality, experimenters investigated the conditions that determine perception of the `upright.` A tilted chair that could be ...
Ver`ti·cal'i·ty noun The quality or state of being vertical; verticalness. [ R.] « The different points of the verticality .» Sir T. Browne. 
[n] - position at right angles to the horizon
verticalness noun position at right angles to the horizon