equivalence

e·quiv·a·lence  (-kwv-lns)

n.

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.

Thesaurus

Noun	1.	equivalence - a state of being essentially equal or equivalent; equally balanced; "on a par with the best" equality, equation, par 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 comparable; "no comparison between the two books"; "beyond compare" comparability, compare, comparison alikeness, likeness, similitude - similarity in appearance or character or nature between persons or things; "man created God in his own likeness"

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equivalence or equivalency

noun equality, correspondence, agreement, similarity, identity, parallel, match, parity, conformity, likeness, sameness, parallelism, evenness, synonymy, alikeness, interchangeableness