con·vex·i·ty \kənˈveksəd.ē, kän-, -ətē, -i\noun (-es) Etymology: Middle French or Latin; Middle French convexité, fr Latin convexitat-, convexitas, from convexus convex + -itat-, -itas -ity 1.: the quality or state of being convex < a degree of convexity > 2.: a convex surface, curve, part, or body < a man … with a ripe convexity under his waistcoat — Leslie Charteris >