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Non-cognitivism is the meta-ethical view that moral statements lack truth-value and do not assert propositions. A noncognitivist denies the cognitivist claim that "moral judgments are capable of being objectively true, because they describe some feature of the world." If moral statements cannot be true, and if one cannot know something that is not true, noncognitivism implies that moral knowledge is impossible.
While the bare term non-cognitivism usually refers to ethics, it can also be applied in other branches of philosophy, as in theological noncognitivism.