1) Orthogonality 2) Verticality 
• (n.) The quality or state of being perpendicular.
The permissible perpendicular variation of relationship between the bearing surface or the top surface and the axis of the thread (A.k.a. runout or TIR)
Per`pen·dic`u·lar'i·ty noun [ Confer French perpendicularité .] The quality or state of being perpendicular. 
[n] - the quality of being at right angles to a given line or plane (especially the plane of the horizon)
noun the quality of being at right angles to a given line or plane (especially the plane of the horizon)