Definition of "planeness" [planeness]

• The condition of being or having a plane surface. (noun)

The Century Dictionary (Public Domain)

• "- Size of the permissible tolerances of workpiece surfaces, planeness, parallelism and dimensions as well as surface finish"
• "- The grade of parallelism depends on the planeness of the surface worked first."
• "- After the finished size has been achieved, the workpiece is unclamped, deburred at the cutting edges and checked for planeness, accuracy to size and surface finish."