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[ih-kwiv-uh-luh ns or for 3, ee-kwuh-vey-luh ns] /ɪˈkwɪv ə ləns or for 3, ˌi kwəˈveɪ ləns/

noun, Also, (for defs 1, 2).
the state or fact of being equivalent; equality in value, force, significance, etc.
an instance of this; an equivalent.
Chemistry. the quality of having equal valence.
Logic, Mathematics.

(of a logical or mathematical relationship) reflexive, symmetrical, and transitive.
the state of being equivalent or interchangeable
(maths, logic)


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


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    noun, Mathematics. 1. the set of elements associated by an equivalence relation with a given element of a set.

  • Equivalence class partitioning

    testing A software testing technique that involves identifying a small set of representative input values that invoke as many different input conditions as possible. For example, for binary search the following partitions exist: inputs that do or do not conform to pre-conditions, Inputs where the key element is or is not a member of the […]

  • Equivalence partitioning

    equivalence class partitioning

  • Equivalence-relation

    noun, Mathematics. 1. a relation that is reflexive, symmetrical, and transitive, as equality. noun 1. (logic, maths) a relation that is reflexive, symmetric, and transitive: it imposes a partition on its domain of definition so that two elements belong to the same subset if and only if the relation holds between them

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