D defs.my
Entry 3 senses Webster, 1913

Incurvation

· In·cur·va·tion · IPA
01 n. The act of bending, or curving.
  1. 1.
    The act of bending, or curving.
  2. 2.
    The state of being bent or curved; curvature.
    “An incurvation of the rays.” — Derham.
  3. 3.
    The act of bowing, or bending the body, in respect or reverence.