What is the meaning of Rigidity?

The quality or state of being rigid; lack of pliability; the quality of resisting change of physical shape

The amount of resistance with which a body opposes change of form.

Stiffness of appearance or manner; want of ease or elegance.

stickiness (of prices/wages etc.). Describing the tendency of prices and money wages to adjust to changes in the economy with a certain delay.

Source: wiktionary.org