the act of uniting two or more things.
the state of being united.
something formed by uniting two or more things; combination.
a number of persons, states, etc., joined or associated together for some common purpose: student union; credit union.
a group of states or nations united into one political body, as that of the American colonies at the time of the revolution, that of England and Scotland in 1707, or that of Great Britain and Ireland in 1801.
the Union, the United States: The Union defeated the Confederacy in 1865.
a device emblematic of union, used in a flag or ensign, sometimes occupying the upper corner next to the staff or occupying the entire field.
the act of uniting or an instance of being united in marriage or sexual intercourse: an ideal union; an illicit union.
an organization of workers; a labor union.
Also called join, logical sum, sum. the set consisting of elements each of which is in at least one of two or more given sets. Symbol:
the least upper bound of two elements in a lattice.
the process or result of merging or integration of disjoined, severed, or fractured elements, as the healing of a wound or broken bone, the growing together of the parts in a plant graft, the fusion of pieces in a welding process, or the like.
the junction or location at which the merging process has taken place.
any of various contrivances for connecting parts of machinery or the like.
a fabric of two kinds of yarn.
a yarn of two or more fibers.

1400–50; late Middle English < Middle French < Late Latin ūniōn- (stem of ūniō), equivalent to Latin ūn(us) one + -iōn- -ion

interunion, noun, adjective
misunion, noun
preunion, adjective
prounion, adjective
self-union, noun

1. Union, unity agree in referring to a oneness, either created by putting together, or by being undivided. A union is a state of being united, a combination, as the result of joining two or more things into one: to promote the union between two families; the Union of England and Scotland. Unity is the state or inherent quality of being one, single, individual, and indivisible (often as a consequence of union): to find unity in diversity; to give unity to a work of art. 5. See alliance. 8. wedlock; liaison.

1, 2. separation, division.
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a township in NE New Jersey.
a city in NW South Carolina.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To unions
World English Dictionary
union (ˈjuːnjən)
1.  the condition of being united, the act of uniting, or a conjunction formed by such an act
2.  an association, alliance, or confederation of individuals or groups for a common purpose, esp political
3.  agreement or harmony
4.  short for trade union
5.  the act or state of marriage or sexual intercourse
6.  a device on a flag representing union, such as another flag depicted in the top left corner
7.  a device for coupling or linking parts, such as pipes
8.  (often capital)
 a.  an association of students at a university or college formed to look after the students' interests, provide facilities for recreation, etc
 b.  the building or buildings housing the facilities of such an organization
9.  maths Also called: join a set containing all members of two given sets. Symbol: ⋃, as in A⋃B
10.  in 19th-century England
 a.  a number of parishes united for the administration of poor relief
 b.  a workhouse supported by such a combination
11.  textiles a piece of cloth or fabric consisting of two different kinds of yarn
12.  (modifier) of or related to a union, esp a trade union
[C15: from Church Latin ūniō oneness, from Latin ūnus one]

Union (ˈjuːnjən)
1.  (Brit)
 a.  the union of England and Wales from 1543
 b.  the union of the English and Scottish crowns (1603--1707)
 c.  the union of England and Scotland from 1707
 d.  the political union of Great Britain and Ireland (1801--1920)
 e.  the union of Great Britain and Northern Ireland from 1920
2.  (US)
 a.  the United States of America
 b.  the northern states of the US during the Civil War
 c.  (as modifier): Union supporters
3.  short for the Union of South Africa

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1410, "action of joining one thing to another," from O.Fr. union (12c.), from L.L. unionem (nom. unio) "oneness, unity, a uniting," also in L. meaning "a single pearl or onion," from unus "one," from PIE *oinos (see one). Sense of "action of uniting into one political body"
is attested from 1547. Meaning "group of people or states" is from 1660. Short for trade union, it is recorded from 1833. U.S. political sense is attested from 1775; used especially during the Civil War, in ref. to the remainder of the United States after the Southern secession. Unionize "make into a union" is attested from 1841.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

union un·ion (yōōn'yən)

  1. The joining or amalgamation of two or more bodies.

  2. The structural adhesion of the edges of a wound.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
union   (yn'yən)  Pronunciation Key 
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 . Compare intersection.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

Union definition

The United States; especially the northern states during the Civil War, which remained with the original United States government. (Compare Confederacy.)

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences for unions
The knights of labor sought to incorporate craft unions into the knights.
The main method the unions used to effect change was strike action.
Many strikes were painful events for both sides, the unions and the management.
It renewed its efforts at working through the trade unions and political
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