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- DictionaryE·quiv·a·lence class/əˈkwivələns ˌklas/
noun
- 1. the class of all members of a set that are in a given equivalence relation.
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In mathematics, when the elements of some set have a notion of equivalence (formalized as an equivalence relation), then one may naturally split the set into equivalence classes. These equivalence classes are constructed so that elements and belong to the same equivalence class if, and only if, they are equivalent. Wikipedia