The metaethical theory that moral statements express non-cognitive mental states like attitudes, emotions, or commitments rather than beliefs about moral facts. It's a sophisticated development of emotivism that better accounts for moral reasoning.
From Latin 'expressus' (pressed out, expressed) and '-ism'. Developed in the late 20th century by philosophers like Simon Blackburn and Allan Gibbard as a more nuanced alternative to earlier emotivist theories.
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