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identical proposition

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noun Logic.
  1. a proposition in which the subject and predicate have the same meaning, as, “That which is mortal is not immortal.”
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Origin of identical proposition

First recorded in 1635–45
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for identical proposition

identical proposition

noun
  1. logic a necessary truth, esp a categorial identity, such as whatever is triangular has three sides
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012