Definify.com
Webster 1913 Edition
Rigidity
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.
Stiffness of appearance or manner; want of ease or elegance.
Sir H. Wotton.
3.
Severity; rigor.
[Obs. orR.]
Bp. Burnet.
Syn. – Stiffness; rigidness; inflexibility.
Webster 1828 Edition
Rigidity
RIGID'ITY
,Noun.
1.
Stiffness; want of pliability; the quality of not being easily bent.2.
A brittle hardness, as opposed to ductibility, malleability and softness.3.
Stiffness of appearance or manner; want of ease or airy elegance.