Jisho

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Noun
1. unionMathematics
Wikipedia definition
2. Union (set theory)In set theory, the union (denoted as ∪) of a collection of sets is the set of all distinct elements in the collection. The union of a collection of sets gives a set .
Read “Union (set theory)” on English Wikipedia
Read “和集合” on Japanese Wikipedia
Read “Union (set theory)” on DBpedia

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