# Rigidity

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Look up or rigidity in Wiktionary, the free dictionary.rigid |

**Rigid** or **rigidity** may refer to:

## Mathematics and physics[edit]

- Stiffness, the property of a solid body to resist deformation, which is sometimes referred to as rigidity
- Structural rigidity, a mathematical theory of the stiffness of ensembles of rigid objects connected by hinges
- Rigidity (electromagnetism), the resistance of a charged particle to deflection by a magnetic field
- Rigidity (mathematics), a property of a collection of mathematical objects (for instance sets or functions)
- Rigid body, in physics, a simplification of the concept of an object to allow for modelling
- Rigid transformation, in mathematics, a rigid transformation preserves distances between every pair of points

## Medicine[edit]

- Rigidity (neurology), an increase in muscle tone leading to a resistance to passive movement throughout the range of motion
- Rigidity (psychology), an obstacle to problem solving which arises from over-dependence on prior experiences

## Other uses[edit]

- Real rigidity, and nominal rigidity, the resistance of prices and wages to marketchanges in macroeconomics
- Ridgid, a brand of tools

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