General English

General Science

  • adjective curved outwards like the outer surface of a sphere or ellipsoid


  • Said of a curve that bulges toward some reference point, usually the horizontal axis or the origin of a diagram. More formally, a curve is convex from below (or convex to something below it) if all straight lines connecting points on it lie on or above it. Contrasts with concave.
  • Said of a set that contains all straight line segments joining points within it.


  • Having a surface, side, or boundary that curves outward, such as the outer surface of a sphere. This contrasts with concave, which has a surface or boundary that curves inward.


  • adjective curving towards the outside

Origin & History of “convex”

Convex was borrowed from Latin convexus, mainly an architectural term meaning ‘arched, vaulted’. The element -vexus probably came from vehere ‘carry’ (source of English vehicle), the notion being that vaults are ‘carried together’ (Latin com- ‘together’) to meet at a point at the centre of a roof, although some have speculated that it is related to Latin vārus ‘bent, knock-kneed’ (source of English prevaricate).