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equivalence

[ih-kwiv-uh-luh ns or for 3, ee-kwuh-vey-luh ns] /ɪˈkwɪv ə ləns or for 3, ˌi kwəˈveɪ ləns/
noun, Also, equivalency (for defs 1, 2).
1.
the state or fact of being equivalent; equality in value, force, significance, etc.
2.
an instance of this; an equivalent.
3.
Chemistry. the quality of having equal valence.
4.
Logic, Mathematics.
  1. Also called material implication. the relation between two propositions such that the second is not false when the first is true.
  2. Also called material equivalence. the relation between two propositions such that they are either both true or both false.
  3. the relation between two propositions such that each logically implies the other.
adjective
5.
(of a logical or mathematical relationship) reflexive, symmetrical, and transitive.
Origin
1535-1545
1535-45; < Middle French < Medieval Latin aequivalentia, equivalent to Latin aequivalent- equivalent + -ia -ia; see -ence
Related forms
nonequivalence, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for equivalence
  • Written language is thus a point-to-point equivalence, to borrow a mathematical phrase, to its spoken counterpart.
  • Only the clerks know what is available, only they judge the equivalence and can give or take a few square meters here and there.
  • Harmonic quintessence and the formulation of a fundamental energy equivalence equation.
  • Capital and income are not taxed with any mathematical equivalence, and inflation is not directly addressed.
  • There is no equivalence between the acceptance of evolution and the global warming agenda.
  • The formulation of harmonic quintessence and a fundamental energy equivalence equation.
  • Here, the kind of equivalence used represents a restrictive aspect of reality as an economic one.
  • See now you can go see what the equivalence is between the gases.
  • Greg--Even for you, that's a ridiculous equivalence.
  • But it's also a false moral equivalence to say that because all of the actors are flawed, they are all equally bad.
British Dictionary definitions for equivalence

equivalence

/ɪˈkwɪvələns/
noun
1.
the state of being equivalent or interchangeable
2.
(maths, logic)
  1. the relationship between two statements, each of which implies the other
  2. Also called biconditional. 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 –(pq) ≡ –p ∨ –q

equivalency

/ˌɛkwɪˈveɪlənsɪ/
noun
1.
(chem) the state of having equal valencies
Derived Forms
equivalent, adjective
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
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Word Origin and History for equivalence
n.

1540s, from French équivalence, from Medieval Latin aequivalentia, from aequivalentem (see equivalent). Related: Equivalency (1530s).

Online Etymology Dictionary, © 2010 Douglas Harper
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