David Lewis's modal realism, the paradigm possibilist framework, entails that every individual exists necessarily as a denizen of some world, making necessitism a structural consequence of the view.

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David Lewis(the philosopher who created this theory): An influential American philosopher (1941-2001) who developed Counterpart Theory as a way to understand how we talk about objects in different possible worlds.
Denizen(describing how individuals relate to worlds): An inhabitant or resident of a place; in this context, it just means 'something that exists in or belongs to a world.'
Necessarily: "Necessarily" means something must be true in all possible situations—it's not just true right now, but couldn't be false under any circumstances. For example, "2+2=4 necessarily" means there's no possible way 2+2 could equal anything other than 4. This contrasts with "contingently" true facts, like "it's raining today," which happen to be true but could have been false.
Possibilist framework(describing the type of theory modal realism represents): A philosophical approach that takes seriously the idea that many different things *could* exist or be true, not just what actually is.

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