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logical sum

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un⋅ion

  [yoon-yuhn]
–noun
1. the act of uniting two or more things.
2. the state of being united.
3. something formed by uniting two or more things; combination.
4. a number of persons, states, etc., joined or associated together for some common purpose: student union; credit union.
5. 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.
6. the Union. the United States: The Union defeated the Confederacy in 1865.
7. 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.
8. the act of uniting or an instance of being united in marriage or sexual intercourse: an ideal union; an illicit union.
9. an organization of workers; a labor union.
10. Mathematics.
a. 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: ∪
b. the least upper bound of two elements in a lattice.
11. 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.
12. the junction or location at which the merging process has taken place.
13. any of various contrivances for connecting parts of machinery or the like.
14. Textiles.
a. a fabric of two kinds of yarn.
b. a yarn of two or more fibers.
Origin:
1400–50; late ME < MF < LL ūniōn- (s. of ūniō), equiv. to L ūn(us) one + -iōn- -ion

Synonyms:
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.

Antonyms:
1, 2. separation, division.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Cultural Dictionary

Union

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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Word Origin & History

union 
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, © 2001 Douglas Harper
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Legal Dictionary

Main Entry: union
Function: noun
1 : an act or instance of uniting or joining two or more things into one; especially : the formation of a single political unit from two or more separate and individual units
2 : something that is made one : something formed by a combining or coalition of its members: as a : a confederation of independent individuals (as nations or persons) for some common purpose b : a political unit constituting an organic whole formed usually from previously independent units (as England and Scotland in 1707) which have surrendered their principal powers to the government of the whole or to a newly created government (as the U.S. in 1789) c : LABOR UNION
Merriam-Webster's Dictionary of Law, © 1996 Merriam-Webster, Inc.
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Medical Dictionary

Main Entry: union
Pronunciation: 'yü-ny&n
Function: noun
: an act or instance of uniting or joining two or more things into one: as a : the growing together of severed parts <union of a fractured bone> b : a chemical combination : BOND c : the joining of two germ cells in the process of fertilization
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

union un·ion (y&oomacr;n'yən)
n.

  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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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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