from The Century Dictionary.
- Having two plane surfaces perfectly parallel to each other.
Sorry, no etymologies found.
Moreover, every demonstration proves a predicate of a subject as attaching or as not attaching to it, but in definition one thing is not predicated of another; we do not, e.g. predicate animal of biped nor biped of animal, nor yet figure of plane-plane not being figure nor figure plane.
There are several kinds of mating pairs such as plane-plane, cylinder-cylinder, and cylinder-slot.
An evaluation of the design's mating pairs reveals two plane-plane matings and one cylinder-cylinder mating.