D defs.my
Entry 3 senses Webster, 1913

Rigidity

/rĭj-ĭd'-ət-ē/ · Ri·gid·i·ty · IPA /ɹɪˈd͡ʒɪdɪti/
01 n. The quality or state of being rigid; want of pliability; the quality of resisting change of form; the amount of resistance with which a bod…
  1. 1.
    The quality or state of being rigid; want of pliability; the quality of resisting change of form; the amount of resistance with which a body opposes change of form; -- opposed to flexibility, ductility, malleability, and softness.
  2. 2.
    Stiffness of appearance or manner; want of ease or elegance.
  3. 3.
    Severity; rigor.[Obs. orR.]