Lewis's inference from indispensability in philosophical theorizing to ontological commitment illicitly borrows from scientific indispensability arguments, which themselves remain deeply contested.

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Illicitly(describing a flawed argumentative technique): In a way that breaks the rules of logical reasoning; sneakily using faulty logic without admitting it.
Indispensability(describing what makes something essential to philosophical theorizing): Something that is absolutely necessary and cannot be done without. If something is indispensable to a theory, that theory cannot work or make sense without it.
Indispensability argument (or indispensability arguments)(as the disputed method being borrowed from science): A type of reasoning that says: 'If we need something to make our best scientific or philosophical theories work, then that something probably really exists.' This reasoning is controversial because it assumes that needing something in a theory proves it's real.
Lewis(philosopher who created the similarity metric being discussed): David Lewis was a famous American philosopher who developed influential theories about possible worlds—alternative ways reality could have been.

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