Definition of union in English:


Line breaks: union
Pronunciation: /ˈjuːnjən
, -ɪən/


  • 2A society or association formed by people with a common interest or purpose: [in names]: the Mothers' Union
    More example sentences
    • These groups include clubs, teams, societies, unions, and centres on campus (to name but a few).
    • The society serves as a union of personalities lobbying for the success of the institution similar to the Philadelphia Orchestra.
    • I don't think there's a Turk union or association or club chapter.
  • 2.1A trade union: [in names]: the National Farmers' Union
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    • They have spoken to Unison branches and met trade unionists from other unions.
    • Because of the anti trade union laws the union reps couldn't call one officially.
    • It would be replaced by a system in which the faculty would be represented by a few union leaders.
  • 2.2British An association of independent Churches, especially Congregational or Baptist, for purposes of cooperation.
    More example sentences
    • In 1972 the Presbyterian church of England merged with most of the congregational unions to create the United Reform Church, but the decline in membership was not arrested.
    • Churches Together in South West York, a union of nine churches in the area, are all circulating the petition along with businesses in Micklegate.
    • The governing idea was that the agency for distributing the money should ordinarily be the Baptist unions or conventions in the recipient countries.
  • 3 (the Union) A political unit consisting of a number of states or provinces with the same central government, in particular:
  • 3.1The United States, especially from its founding by the original thirteen states in 1787–90 to the secession of the Confederate states in 1860-1: California is the fastest growing state in the Union when it comes to urban encroachment
  • 3.2 (also the Federal Union) The northern states of the United States which opposed the seceding Confederate states in the American Civil War.
  • 3.3South Africa, especially before it became a republic in 1961.
  • 4 Mathematics The set that comprises all the elements (and no others) contained in any of two or more given sets.
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    • In what follows, we will apply results about centroids of domains to unions of curves or line segments.
    • Consider a graph G which is formed by taking the union of k cycles.
    • Venn extended Boole's mathematical logic and is best known to mathematicians and logicians for his diagrammatic way of representing sets, and their unions and intersections.
  • 4.1 [mass noun] The operation of forming a union.
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    • For Blake, the fact that two sets were being operated together brought to mind another set operation, union.
    • This assembly uses simple programming and mathematical principles: Boolean, union and intersection.
    • It followed that number-theoretic operations could be explained in terms of set-theoretic operations such as intersection, union, and the like.
  • 5A joint or coupling for pipes.
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    • The vertical gas line comes to a T joint below the union toward the bottom side of the water heater and is connected to the top vertical opening of the T joint.
    • Split hoses can be repaired with a proper union joint or re-attach the hose to the machine.
    • Planting the union below soil level helps protect from the cold and planting the union above soil level makes it easier to detect and remove suckers.
  • 6British historical A number of parishes consolidated for the purposes of administering the Poor Laws.
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    • In addition, the new Act created a commission to supervise the establishment of unions of parishes in England and Wales.
    • Homfray was instituted as incumbent of the Bunclody union of parishes by Bishop Peter Barrett in St Mary's Church of Ireland on February 18.
  • 7(In South Asia) a local administrative unit comprising several rural villages.
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    • Ukhia thana had 5 unions; a union is a rural administrative subdivision of the thana comprising several villages.
  • 8A part of a flag with an emblem symbolizing national union, typically occupying the upper corner next to the staff.
  • 9 [mass noun] A fabric made of two or more different yarns, typically cotton and linen or silk.


late Middle English: from Old French, or from ecclesiastical Latin unio(n-) 'unity', from Latin unus 'one'.

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