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Counterpart Theory

David Lewis's theory of modality, stating that an object in one possible world does not literally exist in other worlds, but has "counterparts" in those worlds.

De Dicto / De Re

A distinction in modality. De dicto (of the word) assigns necessity to a statement (e.g., "Necessarily, the winner won"). De re (of the thing) assigns necessity to an object's property (e.g., "The win...

Kripkean Necessity

The concept of a posteriori necessity, such as "Water is H2O," which is true in all possible worlds.

Origin, Necessity of

Kripke's view that an object necessarily has the origin it does (e.g., this table necessarily came from this piece of wood).