Union definition

yo͝onyən
Frequency:
(mathematics) A set, every member of which is an element of one or another of two or more given sets.
noun
15
6
Agreement or harmony resulting from the uniting of individuals; concord.
noun
8
3
A labor union.
noun
7
6
A uniting or being united; combination.
  • A combining, joining, or grouping together of nations, states, political groups, etc. for some specific purpose.
  • A marrying or being married; marriage.
noun
3
2
Of, relating to, or loyal to the United States of America during the Civil War.

A Union soldier.

adjective
2
1
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Of or relating to a labor union or labor union organizing.

The union movement; union negotiations.

adjective
2
1
A township of northeast New Jersey west of New York City; settled c. 1749 by colonists from Connecticut.
2
1
Something united or unified; a whole made up of parts.
  • An organization or confederation uniting various individuals, political units, etc.
  • In England, a former combination of parishes for the joint administration of relief for the poor; also, a workhouse kept up by such a union.
noun
2
1
(countable, computing) A data structure that can store any of various items, but only one at a time.
noun
1
0
A building used for social recreation on a college or university campus.
noun
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2
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A device for joining together parts, as of a machine; esp., a coupling for linking the ends of pipes.
noun
2
2
A design symbolizing political union, used in a flag or ensign, as the white stars on a blue field in the flag of the U.S.
noun
1
1
A fabric made of two or more different kinds of material, as cotton and linen.
noun
1
1
(math.) The set containing all the elements of two or more given sets, and no other elements.
noun
1
1
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 .
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The joining of two files in a relational database. See set theory.
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2
The definition of a union is a group of two or more people who have come together or people have joined for the purposes of collective bargaining in a labor situation.

An example of a union is marriage.

An example of a union is a group of auto workers who have come together to negotiate the terms of their work as a group.

noun
0
1
A coupling device for connecting parts, such as pipes or rods.
noun
0
1
A device on a flag or ensign, occupying the upper inner corner or the entire field, that signifies the union of two or more sovereignties.
noun
0
1
The United States of America regarded as a national unit, especially during the Civil War.
noun
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1
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The act of uniting or the state of being united.
noun
0
1
A combination so formed, especially an alliance or confederation of people, parties, or political entities for mutual interest or benefit.
noun
0
1
The state of matrimony; marriage.
noun
0
1
Sexual intercourse.
noun
0
1
A combination of parishes for joint administration of relief for the poor in Great Britain.
noun
0
1
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A workhouse maintained by such a union.
noun
0
1
An organization at a college or university that provides facilities for recreation; a student union.
noun
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1
A building housing such facilities.
noun
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1
(countable) The act of uniting or joining two or more things into one.
noun
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1
(uncountable) The state of being united or joined.
noun
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1
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(countable) That which is united, or made one; something formed by a combination or coalition of parts or members; a confederation; a consolidated body; a league.
noun
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1
(countable) A trade union; a workers' union.
noun
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1
(countable) A joint or other connection uniting parts of machinery, such as pipes.
noun
0
1
(countable, set theory) The set containing all of the elements of two or more sets.
noun
0
1
(countable) The act or state of marriage.
noun
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1
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(uncountable, archaic, euphemistic) Sexual intercourse.
noun
0
1
(countable, now rare, archaic) A large, high-quality pearl.
noun
0
1
(with determiner, dated, especially 19th century) The United States of America.
noun
0
1
(with determiner, US, historical) Those of the United States that did not secede at the time of the Civil War.
noun
0
1
The 0-10-2 train configuration. Derived from the name of the only U.S. company to use that configuration.
noun
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1
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the Union
  • the United States of America, specif. when regarded as a federal union
  • the North in the Civil War
idiom
1
1

Other Word Forms

Noun

Singular:
union
Plural:
unions

Idioms and Phrasal Verbs

the Union

Origin of union

  • Middle English from Old French from Late Latin ūniō ūniōn- from Latin ūnus one oi-no- in Indo-European roots

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Old French union, from Late Latin unionem, from Latin Å«nus (“one")

    From Wiktionary