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G. E. Moore's Principia Ethica (1903) is a foundational work in metaethics. Moore argued against the "naturalistic fallacy," which he defined as defining the term "good" in terms of natural properties like pleasure or utility. He contended that "good" is a simple, unanalyzable quality that cannot be defined by any other property. Moore's "open-question argument" posits that for any proposed definition of "good," it remains a meaningful question whether that definition is actually good. If the question is meaningful, the definition is incorrect because a true definition should be self-evident. This work was influential in establishing ethical intuitionism and shifting philosophical focus towards the analysis of ethical concepts.1234

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