Quotation by Saul Kripke

Let's call something a rigid designator if in every possible world it designates the same object, a non-rigid or accidental designator if that is not the case. Of course we don't require that the objects exist in all possible worlds.... When we think of a property as essential to an object we usually mean that it is true of that object in any case where it would have existed. A rigid designator of a necessary existent can be called strongly rigid.
Saul Kripke (b. 1940), U.S. analytic philosopher. repr. In Semantics and Natural Language, D. Davidson and Harmon. Naming and Necessity, p. 48 (1972).

Foundation of the author's "possible world" semantics.
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