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1. The state or condition of being equivalent; equality.
2. Mathematics An equivalence relation.
3. 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.


(ɪˈkwɪvələns) or


1. the state of being equivalent or interchangeable
2. (Logic) maths logic
a. the relationship between two statements, each of which implies the other
b. 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


(ɪˈkwɪv ə ləns or, for 3, ˌi kwəˈveɪ ləns)

1. the state or fact of being equivalent; equality in value, force, significance, etc.
2. an instance of this; an equivalent.
3. the state of having equal chemical valence.
4. Logic.
a. the relation between two propositions such that they are either both true or both false.
b. the relation between two propositions such that each logically implies the other.
5. (of a logical or mathematical relationship) reflexive, symmetrical, and transitive.
[1535–45; < Middle French < Medieval Latin]



neck and neck Even, equal, on a par; abreast, at the same pace. Based on available citations, figurative use of this expression is as old as the literal horse-racing one, both dating from the early 19th century. It still finds frequent application.

Production ran neck and neck in the studios, but the second version … reached the public screen last. (The Times, June, 1955)

nip and tuck So close as to be of uncertain outcome; neck and neck, on a par, even; up in the air, questionable. This chiefly U.S. term is of puzzling origin and inconsistent form, appearing in print in the 1800s as rip and tuck, nip and tack, and nip and chuck, before assuming its present nip and tuck. Its original restriction to contexts describing close contests, usually athletic, lends credence to the claim that it originated as a wrestling term (Barrère and Leland, Dictionary of Slang, 1890). The expression is now employed in much broader contexts, indicative of any kind of uncertainty.

It is nip and tuck whether such a last great achievement of the bipartisan foreign policy can be ratified before … the Presidential race. (The Economist, May, 1948)

ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.equivalence - a state of being essentially equal or equivalent; equally balanced; "on a par with the best"
status, position - the relative position or standing of things or especially persons in a society; "he had the status of a minor"; "the novel attained the status of a classic"; "atheists do not enjoy a favorable position in American life"
egalite, egality - social and political equality; "egality represents an extreme leveling of society"
tie - equality of score in a contest
2.equivalence - essential equality and interchangeability
equality - the quality of being the same in quantity or measure or value or status
parity - functional equality
nonequivalence - not interchangeable
3.equivalence - qualities that are comparableequivalence - qualities that are comparable; "no comparison between the two books"; "beyond compare"
alikeness, likeness, similitude - similarity in appearance or character or nature between persons or things; "man created God in his own likeness"



The state of being equivalent:


[ɪˈkwɪvələns] Nequivalencia f


[ɪˈkwɪvələns] néquivalence f


nÄquivalenz f, → Entsprechung f


[ɪˈkwɪvələns] nequivalenza


n equivalencia
References in classic literature ?
And thus, O circular philosopher, I hear some reader exclaim, you have arrived at a fine Pyrrhonism, at an equivalence and indifferency of all actions, and would fain teach us that if we are true, forsooth, our crimes may be lively stones out of which we shall construct the temple of the true God!
Table 2 summarizes the types of equivalences useful for qualitative cross-cultural research proposed in this paper.
Table 3 illustrates the courses of action in the qualitative research process, and positions the equivalences in the process.
The resultant outcome is that we observe the relationship predominantly between antecedent stimuli and the response and reinforcer equivalences are obscured.
And yet, of course, art itself is a kind of mastery of the apotropaic, which Penck broadly achieves through the conceptual asymmetry of his imagery--the occult balance he creates from the "system" of expressive equivalences he establishes.
The five participants trained on the altered MTS procedure averaged only about 51 % accuracy across symmetry and equivalences tests despite their accurate baseline performances.
Reading and crossmodal transfer of stimulus equivalences in severe retardation.
A cofunctor F from a subcategory of O to Top will be called an isotopy cofunctor if F takes all inclusions which are isotopy equivalences to homotopy equivalences.
For illustrations of mathematical relationships between equivalences we selected basic vocabulary commonly used in daily conversation, such as in greetings and simple introductions with more than one equivalent.
In the development of ontology for a teaching course in E-earning the equivalences cannot be avoided.
This phenomenon has been studied on many occasions within the Experimental Analysis of Behavior, beginning with Sidman's discoveries in 1971 (see Garcia & Benjumea, 2001) and continuing with those of other authors within the framework of equivalence classes.
This definition and more recent studies of equivalence classes share a common theme, the emergence of untrained relations.