• IPA: /ˈjuːnjən/

union

1. (countable) The act of uniting or joining two or more things into one.
2. (uncountable) The state of being united or joined.
3. (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.
4. (countable) A trade union; a workers' union.
5. (countable) An association of students at a university for social and/or political purposes; also in some cases a debating body.
6. (countable) A joint or other connection uniting parts of machinery, such as pipes.
7. (countable, set theory) The set containing all of the elements of two or more sets.
8. (countable) The act or state of marriage.
9. (uncountable, archaic, euphemistic) Sexual intercourse.
10. (countable, programming) A data structure that can store any of various types of item, but only one at a time.
11. (countable, now rare, archaic) A large, high-quality pearl.
    • 1624, Democritus Junior [pseudonym; Robert Burton], The Anatomy of Melancholy: […], 2nd edition, Oxford, Oxfordshire: Printed by John Lichfield and James Short, for Henry Cripps, OCLC 54573970 ↗, partition II, section 3, member 3:

      Nonius the senator hath a purple coat as stiff with jewels as his mind is full of vices; rings on his fingers worth 20,000 sesterces, and […] an union in his ear worth an hundred pounds' weight of gold {{...}

    • c. 1599–1602, William Shakespeare, “The Tragedie of Hamlet, Prince of Denmarke”, in Mr. William Shakespeares Comedies, Histories, & Tragedies: Published According to the True Originall Copies (First Folio), London: Printed by Isaac Iaggard, and Ed[ward] Blount, published 1623, OCLC 606515358 ↗, (please specify the act number in uppercase Roman numerals):

      And in the cup an union shall he throw, Richer than that which four successive kings In Denmark's crown have worn.

12. (historical) An affiliation of several parishes for joint support and management of their poor; also the jointly-owned workhouse.

• junction, coalition, combination

• reunion
• reunification
• unify
• unity

• French: union
• German: Vereinigung, Union, Verein, Verband
• Italian: unione
• Portuguese: união, junção
• Russian: сою́з
• Spanish: unión

• French: groupement
• German: Vereinigung, Union
• Portuguese: união
• Russian: сою́з
• Spanish: unión

• French: connexion
• Russian: му́фта

• French: réunion
• German: Vereinigung, Vereinigungsmenge
• Italian: unione
• Portuguese: união
• Russian: объедине́ние мно́жеств
• Spanish: unión

• French: marriage
• Portuguese: matrimónio (Portugal), matrimônio (Brazil)
• Russian: сою́з

• French: accouplement, copulation, fornication
• German: Vereinigung
• Portuguese: sexo
• Russian: сноше́ние

• French: union
• Russian: объедине́ние

union (unions, present participle unioning; past and past participle unioned)

1. To combine sets using the union operation.

union (plural unions)

1. The 0-10-2 locomotive wheel arrangement.

1. (US, with determiner, dated, especially 19th century) The United States of America.
2. (US, with determiner, historical) Those of the United States that did not secede at the time of the Civil War (of the United States of America).
3. Place names:
   1. A community in Central Elgin, Elgin County.
   2. A barangay in Ubay, Bohol.
   3. A village on the south cast of the island of Siargao.
   4. A town in Greene County, Alabama.
   5. A ghost town in Merced County, California.
   6. A former unincorporated community in Napa County, California.
   7. A small town in Tolland County, Connecticut.
   8. A village in McHenry County, Illinois.
   9. An unincorporated community in Clay Township, Pike County.
   10. A tiny city in Hardin County, Iowa.
   11. A home rule city in Boone County, Kentucky.
   12. A town in Knox County, Maine.
   13. A town in Neshoba County, and.
   14. A city/county seat in Franklin County, Missouri.
   15. An unincorporated community in Clark County, Missouri.
   16. A village in Cass County, Nebraska.
   17. A village/and/CDP in the town of Wakefield.
   18. A hamlet in Madison County, New York.
   19. A large town in Broome County, New York.
   20. A city in Montgomery County, and.
   21. A city in Union County, Oregon.
   22. A city/county seat in Union County, South Carolina.
   23. An unincorporated community in Floyd County, Virginia.
   24. A small town/county seat in Monroe County, West Virginia.
   25. A small town in Burnett County, Wisconsin.
   26. A small town in Door County, Wisconsin.
   27. A town/and/unincorporated community in Eau Claire County, Wisconsin.
   28. An unincorporated community in the town of Lima.
   29. A small town in Pierce County, Wisconsin.
   30. A town/and/unincorporated community in Rock County, Wisconsin.
   31. A small town in Vernon County, Wisconsin.
   32. A small town in Waupaca County, Wisconsin.