|Counterpart: in the philosophy of David K. Lewis a counterpart is an object in a possible world, which corresponds to an object in our world - the actual world. For David Lewis no object is in more than one world. Therefore, he must accept counterparts. The counterparts may correspond exactly to the objects in our actual world or deviate more or less strongly from them. See also counterpart theory, counterpart relation, possible worlds, modal realism, actualism.|
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Counterpart / Lewis: the things in the actual world have counterparts in other worlds. Things that resemble them more than any other thing. Therefore, no individual has accidental properties, properties that it does not have in other worlds.
Ways a World may be Oxford New York 2003