Ethical naturalism (also called moral naturalism or naturalistic cognitivistic definism[1]) is the meta-ethical view which claims that:
Ethical sentences express propositions.
Some such propositions are true.
Those propositions are made true by objective features of the world, independent of human opinion.
These moral features of the world can be reduced to some set of non-moral features.
This makes ethical naturalism a definist form of moral realism, which is in turn a form of cognitivism. Ethical naturalism stands in opposition to ethical non-naturalism, which denies that moral terms refer to anything other than irreducible moral properties, as well as to all forms of moral anti-realism, including ethical subjectivism (which denies that moral propositions refer to objective facts), error theory (which denies that any moral propositions are true), and non-cognitivism (which denies that moral sentences express propositions at all).
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