polygonality

noun1

1. •
   The state of being a polygon, the degree to which an object is polygonal.

   • M. Glouberman (1986), Descartes: The Probable and the Certain, →ISBN, page 213: “Conversely, (b) the condition of polygonality is a part of each of the conditions of triangularity, quadrilaterality, etc., and hence the latter are more than the term which collects them: the collecting term is, in other words, less than the terms it collects.”