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Definist fallacy
The definist fallacy is a logical fallacy, coined by William Frankena in 1939, that involves the definition of one property in terms of another.
The philosopher William Frankena first used the term ''definist fallacy'' in a paper published in the British analytic philosophy journal ''Mind'' in 1939. In this article he generalized and critiqued G. E. Moore's naturalistic fallacy, which argued that ''good'' cannot be defined by natural properties, as a broader confusion caused by attempting to define a term using non-synonymous properties. Frankena argued that the ''naturalistic fallacy'' is a complete misnomer because it is neither limited to naturalistic properties nor necessarily a fallacy. On the first word (''naturalistic''), he noted that Moore rejected defining ''good'' in non-natural as well as natural terms.
On the second word (''fallacy''), Frankena rejected the idea that it represented an error in reasoning – a fallacy as it is usually recognized – rather than an error in semantics. In Moore's open-question argument, because questions such as "Is that which is pleasurable good?" have no definitive answer, then pleasurable is not synonymous with good. Frankena rejected this argument as the fact that there is always an open question merely reflects the fact that it makes sense to ask whether two things that may be identical in fact are. Thus, even if good ''is'' identical to pleasurable, it makes sense to ask whether it is; the answer may be "yes", but the question was legitimate. This seems to contradict Moore's view which accepts that sometimes alternative answers could be dismissed without argument, however Frankena objects that this would be committing the fallacy of begging the question.〔
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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