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Definition of "equivalence" []

  • The state or condition of being equivalent; equality. (noun)
  • Mathematics An equivalence relation. (noun)
  • Logic The relationship that holds for two propositions that are either both true or both false, so that the affirmation of one and the denial of the other results in contradiction. (noun)
  • The state of being equivalent or interchangeable (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

  • The relationship between two statements, each of which implies the other (noun)
  • The binary truth-function that takes the value true when both component sentences are true or when both are false, corresponding to English if and only if. Symbol: ≡ or ↔, as in –(p ∧ q) ≡ –p ∨ –q (noun)

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Use "equivalence" in a sentence
  • "It was then, also, that he coined the term equivalence principle."
  • "The tripe about moral equivalence is just cover for ignorant wingnuts to argue that the US SHOULDNT do what is right."
  • "To make that false equivalence is to parade your ignorance."