Union Definition (Illustrated Mathematics Dictionary) - Math Is Fun

Math is Fun ABCDEFGHIJKLMNOPQRSTUVWXYZ Definition of Union more ... Union

The set made by combining the elements of two sets.

So the union of sets A and B is the set of elements in A, or B, or both.

The symbol is a special "U" like this: ∪

Example: Soccer = {alex, hunter, casey, drew} Tennis = {casey, drew, jade} Soccer ∪ Tennis = {alex, hunter, casey, drew, jade} In words: the union of the "Soccer" and "Tennis" sets is alex, hunter, casey, drew and jade

See: Set, Intersection (sets), Venn Diagram Sets and Venn Diagrams Copyright © 2025 Rod Pierce

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