[f. as prec. + -ITY; cf. med.L. triangulāritās (Duns Scotus, a. 1308: prob. older).] The quality of being triangular; triangular form.
a. 1688. Cudworth, Immut. Mor. (1731), 14. Things are White by Whiteness, and Black by Blackness, Triangular by Triangularity, and Round by Rotundity.
a. 1751. Bolingbroke, Ess., Hum. Knowl., v. Wks. 1754, III. 436. We say, for instance, not only that certain figures are triangular, but we discourse of triangularity.
1788. T. Taylor, Proclus’ Comm., I. 48. Its triangularity would be essential, supposing every species of triangles but the isosceles extinct.
1805. R. P. Knight, On Taste, I. iii. (ed. 2), 38. It partook … of the qualities of the immutable idea of triangularity.
