equivalence class

/IH0 K W IH1 V AH0 L AH0 N S K L AE0 S/
noun
  1. 1

    Any one of the subsets into which an equivalence relation partitions a set, each of these subsets containing all the elements of the set that are equivalent under the equivalence relation.

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Source: https://en.wiktionary.org/wiki/equivalence%20class