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Definition of union

union

/ˈjuːnjən/
Plural:unions
•
Adjective:unionized
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union Lexical Profile

union Game Scores & Validity

• noun

1

American The name of several municipalities in the United States, including a populous suburban township in Union County, northeastern New Jersey, and a city in northern Kentucky within the Cincinnati metropolitan area.


2

In mathematics, the set containing all elements that belong to at least one of two or more given sets.

Example

"Students were asked to shade the Venn diagram to represent the union of Set A and Set B."


3

A political federation or league of states or nations, or the state of harmony and agreement within a group.

Example

"The delegates worked tirelessly to preserve the fragile union among the allied provinces."


4

The action or fact of joining or being joined together, especially in a political, institutional, or marital context.

Example

"The treaty established a lasting economic union between the neighboring nations."


5

An organized association of workers formed to protect and further their rights and interests; a labor union or trade union.

Example

"The teachers' union negotiated a new contract that included smaller class sizes and better healthcare benefits."

Synonyms
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Antonyms
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• Rhymes for union

Word Origin & Etymology

Borrowed from Anglo-Norman and Old French union, from Late Latin unio ('oneness, unity'), a derivative of Latin unus ('one').

Usage Trend

Historical frequency of usage in published text.

180019102020

Cite this Entry


Wordmom. (2026). Definition of Union. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/union
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