 The second side of the “golden triangle” connects meaning with possibility. Following Carnap (1947), Chalmers suggests that we can use possible worlds semantics to individuate particular meanings in terms of their representational properties. In standard possible world semantics, the meaning of ‘doctor’ is identified with an intension that maps possible worlds to extensions. An expression’s intension reflects the modal profile of the object, kind, or property picked out. Identifying meanings with intensions therefore establishes an important constitutive connection between meanings and modal claims. If ‘doctor’ and ‘physician’ are associated with the same meaning, then it’s true in all possible worlds that all doctors are physicians and all physicians are doctors. And conversely if two expressions are co-extensive in all possible worlds, then they have the same meaning.