[f. as prec. + -NESS. The stress varies.] Convex quality, convexity.
1738. Med. Ess. & Observ. (ed. 2), IV. 134. Were not the Cornea of a Convexness answerable to the Flatness of their Eyes.
1815. J. Gilchrist, Labyrinth Demol., 44. Convexness and concaveness usually meet in the same object.