Union | Definition of Union at Dictionary.com
https://www.dictionary.com/browse/union
A set whose members belong to at least one of a group of two or more given sets. The union of the sets {1,2,3} and {3,4,5} is the set {1,2,3,4,5}, and the union of the sets {6,7} and {11,12,13} is the set {6,7,11,12,13}. The symbol for union is.
DA: 22 PA: 32 MOZ Rank: 23