The 2-D Argument Against Metaethical Naturalism

A few years back I noted that 2-D semantics provides a straightforward refutation of synthetic metaethical naturalism (SEN):  SEN implies that moral terms differ in their primary and
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A few years back I noted that 2-D semantics provides a straightforward refutation of synthetic metaethical naturalism (SEN):  SEN implies that moral terms differ in their primary and secondary intensions, this is clearly false (moral terms are "semantically neutral", or exhibit 2-D symmetry, in that their application to a world does not vary depending on whether we consider it as actual or as counterfactual), and so SEN must be false.As I've been developing this argument in my paper 'Moral Symmetry and Two Dimensional Semantics', it occurs to me that 2-D semantics enables an even broader argument against metaethical naturalism.To address the Open Question Argument, naturalists are committed to a divergence between the intension of 'good' (and other moral terms) and its meaning or cognitive significance.  Such divergences are commonplace so far as the secondary intension is concerned: 'water' and 'H2O' have different meanings, despite picking out just the same stuff. . .

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