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equivalence

/i kwiv"euh leuhns/ or, for 3, /ee'kweuh vay"leuhns/, n.
1. the state or fact of being equivalent; equality in value, force, significance, etc.
2. an instance of this; an equivalent.
3. Chem. the quality of having equal valence.
4. Logic, Math.
a. Also called material implication. the relation between two propositions such that the second is not false when the first is true.
b. Also called material equivalence. the relation between two propositions such that they are either both true or both false.
c. the relation between two propositions such that each logically implies the other.
5. (of a logical or mathematical relationship) reflexive, symmetrical, and transitive.
Also, equivalency (for defs. 1, 2).
[1535-45; < MF < ML aequivalentia, equiv. to L aequivalent- EQUIVALENT + -ia -IA; see -ENCE]

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logic
also called  equivalence of propositions

in logic and mathematics, the formation of a proposition from two others which are linked by the phrase “if, and only if.” The equivalence formed from two propositions p and q also may be defined by the statement “p is a necessary and sufficient condition for q.

also called  equivalency,  plural  equivalences  or  equivalencies

in classical prosody, the principle that one long syllable is equal to two short ones. The principle is used as the basis for substitution in quantitative verse.

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Universalium. 2010.

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• équivalence — [ ekivalɑ̃s ] n. f. • 1361; bas lat. æquivalentia, de æquivalere 1 ♦ Qualité de ce qui est équivalent. ⇒ adéquation, égalité, homologie, identité. Les jacqueries « mettent en avant un principe d équivalence, vie contre vie » (Camus). ♢ (1864)… …   Encyclopédie Universelle

• Equivalence — or equivalent may refer to: In chemistry: Equivalent (chemistry) Equivalence point Equivalent weight In computing: Turing equivalence (theory of computation) In ethics: Moral equivalence In history: The Equivalent, a sum paid from England to… …   Wikipedia

• Equivalence — Équivalence Voir « équivalence » sur le Wiktionnaire …   Wikipédia en Français

• Equivalence — E*quiv a*lence ([ e]*kw[i^]v [.a]*lens), n. [Cf. F. [ e]quivalence, LL. aequivalentia.] 1. The condition of being equivalent or equal; equality of worth, value, signification, or force; as, an equivalence of definitions. [1913 Webster] 2. Equal… …   The Collaborative International Dictionary of English

• equivalence — 1540s, from Fr. équivalence, from M.L. aequivalentia, from aequivalentem (see EQUIVALENT (Cf. equivalent)). Related: Equivalency (1530s) …   Etymology dictionary

• equivalence — [ē kwiv′ə ləns, ikwiv′ə ləns] n. [Fr équivalence < ML aequivalentia] 1. the condition of being equivalent; equality of quantity, value, force, meaning, etc. 2. Chem. equality of combining capacity; the principle that different weights of… …   English World dictionary

• Equivalence — E*quiv a*lence, v. t. To be equivalent or equal to; to counterbalance. [R.] Sir T. Browne. [1913 Webster] …   The Collaborative International Dictionary of English

• equivalence — relation …   Philosophy dictionary

• equivalence — index analogy, balance (equality), correspondence (similarity), identity (similarity), par ( …   Law dictionary

• equivalence — [n] sameness, similarity adequation, agreement, alikeness, compatibility, conformity, correlation, correspondence, equality, evenness, exchangeability, identity, interchangeability, interchangeableness, likeness, match, par, parallel, parity,… …   New thesaurus

• Équivalence — Sur les autres projets Wikimedia : « Équivalence », sur le Wiktionnaire (dictionnaire universel) Cette page d’homonymie répertorie les différents sujets et articles partageant un même nom. Le mot équivalence peut avoir plusieurs… …   Wikipédia en Français