incurvation

noun4

1. •
   The act of acquiring or being given a curved form; an instance of curving or bending.

   • The incurvation or bending of a ray of light, incident on such a surface. — 1831
2. •
   The state of being curved or bent; any curved shape or formation; curvature; a curve; a bend.
3. •
   A curving inwards; the condition of being curved inwards.
4. •
   (no longer used) Bowing in reverence or worship.