[ad. L. convexitās, f. convexus CONVEX: cf. mod.F. convexité.]
1. The quality or condition of being convex; outward bulging.
1605. Bacon, Adv. Learn., I. vi. § 10. The finiteness or convexity of heaven.
1646. Sir T. Browne, Pseud. Ep., VI. V. 292. By reason of the convexity of the Earth, the eye of man under the Æquator cannot discover both the poles.
1794. G. Adams, Nat. & Exp. Philos., II. xv. 186. If the radius of convexity be less than the radius of concavity, the meniscus will have all the properties of a convex lens.
1880. E. White, Cert. in Relig., 70. The cornea … is often untrue in its convexity.
2. A convex curve, surface, side, or part.
1600. Holland, Livy, I. ii. 1348, note. Much like a bow full bent: the convexitie or outward compasse whereof containeth a mile.
1703. Moxon, Mech. Exerc., 220. An Hollow-Mandrel, made fit stifly to receive the convexity of the Globe in its concavity.
1827. Carlyle, Misc., Richter (1869), 2. This mirror is so twisted with convexities and concavities.
1831. Brewster, Optics, vi. 54. A double convex lens with equal convexities.
1872. Baker, Nile Tribut., xii. 207. I had taken so steady an aim at the convexity at the root of the tree.
