connection between moral terms and concepts and natural terms and concepts. This gives Cornell realists a simple response to the charge that you cannot have naturalism without naturalistic fallacy: namely, that metaphysical reduction doesn't imply semantic reduction. This usually goes with a Kripke-Putnam semantic story: moral terms and concepts pick out certain natural properties in virtue of those properties standing in an appropriate causal (social-historical) relation to our tokenings of the terms and concepts. References Boyd, Richard "How to Be A Moral Realist", In G. Sayre-McCord (ed.), Essays on Moral Realism. Cornell University Press. pp. 181–228 (1988) Blackburn, Simon Ruling Passions, Clarendon Press, Oxford 2000, pp. 119–121 Stanford Encyclopedia of Philosophy Meta-ethics Philosophical realism