rigid designator

British

noun

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

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rigid designator

Water is a rigid designator, while “the substance that fills the lakes and oceans” is descriptive.

From New York Times ● Sep. 21, 2022

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023