Union

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.

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.

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 fabric of two kinds of yarn.
a yarn of two or more fibers.

noun
1.
a township in NE New Jersey.
2.
a city in NW South Carolina.
noun
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)

an association of students at a university or college formed to look after the students’ interests, provide facilities for recreation, etc
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 number of parishes united for the administration of poor relief
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
noun the Union
1.
(Brit)

the union of England and Wales from 1543
the union of the English and Scottish crowns (1603–1707)
the union of England and Scotland from 1707
the political union of Great Britain and Ireland (1801–1920)
the union of Great Britain and Northern Ireland from 1920

2.
(US)

the United States of America
the northern states of the US during the Civil War
(as modifier): Union supporters

3.
short for the Union of South Africa

union un·ion (yōōn’yən)
n.

The joining or amalgamation of two or more bodies.

The structural adhesion of the edges of a wound.

union
(yn’yən)
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.

Union definition

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

1. An operation on two sets which returns the set of all elements that are a member of either or both of the argument sets; normally written as an infix upper-case U symbol. The operator generalises to zero or more sets by taking the union of the current partial result (initially the empty set) with the next argument set, in any order.
For example, (a, b, c) U (c, d, e) = (a, b, c, d, e)
2. A type whose values may be of one of a number of other types, thet current type depending on conditions that are only known at run-time. A variable of union type must be allocated sufficient storage space to hold the largest component type. Some unions include extra information to say which type of value the union currently has (a “tagged union”), others rely on the program to keep track of this independently.
A union contrasts with a structure or record which stores values of all component types at once.
3. An SQL operator that concatenates two result sets, that must have the same number and types of columns. The operator may be followed by the word “ALL” to indicate that results that appear in both sets should appear twice in the output.
(2002-02-26)