Source : Webster's Revised Unabridged Dictionary (1913)

Verticality \Ver`ti*cal"i*ty\, n.
   The quality or state of being vertical; verticalness. [R.]

         The different points of the verticality. --Sir T.
                                                  Browne.

Source : WordNet®

verticality
     n : position at right angles to the horizon [syn: {verticalness},
          {erectness}, {uprightness}]