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circular definition

American  

noun

Logic.
  1. a definition in which the definiendum (the expression being defined) or a variant of it appears in the definiens (the expression that defines it).


Example Sentences

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Definitions vary widely; a typically subjective and circular definition comes from Dr. John E. Ikerd, extension professor at the University of Missouri:

From Forbes Nov. 19, 2014

“Best” is apparently defined by being at the service academies, and that is a circular definition.

From Washington Post Dec. 30, 2011

This, however, is a circular definition: it assumes that we already know what is meant by 'known premisses'.

From The Problems of Philosophy by Russell, Bertrand

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