verticality
  垂直,垂直性,垂直狀態
  Ver·ti·cal·i·ty n. The quality or state of being vertical; verticalness.  [R.]
     The different points of the verticality.   --Sir T. Browne.
  ◄ ►
  verticality
       n : position at right angles to the horizon [syn: verticalness,
            erectness, uprightness]