(logic) an expression that identifies the same individual in every possible world: for example, “Shakespeare” is a rigid designator since it is possible that Shakespeare might not have been a playwright but not that he might not have been Shakespeare
noun 1. (in iron, steel, and reinforced-concrete construction) a bent having absolutely rigid connections at the knees.
verb (used with or without object), rigidified, rigidifying. 1. to make or become rigid. verb -fies, -fying, -fied 1. to make or become rigid
adjective 1. stiff or unyielding; not pliant or flexible; hard: a rigid strip of metal. 2. firmly fixed or set. 3. inflexible, strict, or severe: a rigid disciplinarian; rigid rules of social behavior. 4. exacting; thorough; rigorous: a rigid examination. 5. so as to meet precise standards; stringent: lenses ground to rigid specifications. 6. Mechanics. […]
verb (used with object), rigidized, rigidizing. 1. to make rigid, as through special processing or the addition of chemicals, plastics, etc.: rigidized aluminum.