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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!
An equivalence class contains a finite number of perceptually disparate stimuli, all of which have become related to each other and can be used in an interchangeable manner (Sidman 1994).
Some countries are eyeing equivalence as a way to develop a consistent, risk-based solvency regime and reporting requirements for the insurance sector.
This paper, which is based on Nida's equivalence translation theory, discusses the process involved in translation as a mathematical problem.
In summary therefore, following minimal training (one set) on a full MTS task, one-to-many training enables a model to demonstrate equivalence, while a linear protocol fails to produce the effect.
I will also describe two equivalence experiments and a test of the inverse-square law of gravitation.
For instance, Rossier (2004) reported on the cross-cultural equivalence of several personality inventories in frequent use.
This paper examines the sensitivity of inequality and poverty measures to the adult equivalence scale and the unit of analysis.
Related studies indicate that children on the verge of understanding mathematical equivalence exhibit flawed verbal reasoning combined with gestures that depict valid strategies (SN: 3/17/01, p.
As might be expected, certainty equivalence applies only under very restrictive conditions, and economists have extensively studied cases in which the certainty-equivalence principle does not generate the best possible decisions.
ISLAMABAD -- The Competition Commission of Pakistan (CCP) has issued a policy note to the Higher Education Commission (HEC) to revise its Equivalence Standard (ES) for Master's degree programs.