Union

Union generally means that two or more things are joined into one. That can be an organization of several people or organizations, several objects combined into one, and so on. The term may mean:
Trades union: an organization of workers with a common goal.
In politics
The Union, referring to the federation that is the United States
The Union (American Civil War), the states that did not declare their secession
The Union Army, the army of the United States in the Civil War
National Union Party (United States), forerunner of the United States Republican Party during the 1864 election
Act of Union, one of several acts by the English Parliament
United Kingdom, the constitutional result of that legislation
African Union, an inter-governmental organization in Africa
European Union, a supranational and inter-governmental organization in Europe
Government of India, known officially as the Union Government
Personal union, a group of separate, independent states that share the same monarch
Political union, a type of state composed of smaller states
Real union, an intermediate step between personal and political union of states
Soviet Union, Union of Soviet Socialist Republics
State of the Union Address annual speech by the President of the United States
The Union (political coalition) (l'Unione), a twenty-first century Italian political coalition
Unionist Party (Canada), known when in power as the Union Government
Trade union, labor union, employment
In sports and entertainment
Union de Santa Fe, Argentine professional football club
R. Union Saint-Gilloise, Belgian professional football club
Club Atletico Union de Sunchales, lower league Argentine football club
Union Magdalena a Colombian professional football club
The Union, a group of professional wrestlers in opposition to Vince McMahon in the World Wrestling Federation
The supporters' club of the A-League football side Melbourne Victory
Rugby Union
Union (album), a 1991 album by the musical group Yes
Union (band), an American heavy metal band
Union (comic), set in the Star Wars universe
Union (comics), a character published by Wildstorm
"Union", a song by Avail from their 2000 album One Wrench
"Union", a song by the Black Eyed Peas from their album Monkey Business
In education
The term student union can be used in either of two senses:
Students' union, a student organization at many colleges and universities dedicated to student governance (not common in USA, see below)
Student activity center, a building that typically hosts a "union" of student services (e.g., food service, health facilities, lounges) at such institutions (also known as a "student center" or "student commons")
In the United States, the phrase more commonly refers to the building. The phrase "student government" or "student senate" is usually used when referring to the subject of the "Students' union" article.
Union College, a college for which the principal campus sits in Schenectady, New York
Union College (Kentucky), a college in Kentucky
Union Institute & University, a non-traditional educational institution
Union Public Schools, a public school system in Tulsa, Oklahoma
Union Theological College, a college in Northern Ireland
Union Theological Seminary in the City of New York, an ecumenical Christian seminary in New York City, New York
Union Theological Seminary & Presbyterian School of Christian Education, a Christian seminary in Richmond, Virginia
Union University, a Baptist college in Tennessee
In transportation
Union Railroad, any of several railroad companies
Union (ship), a ship sunk in Fiji in 1804
In tradesmanship
Union (electrical), a term sometimes used for a butt connector used to splice wires
Union (hardware), a term sometimes used for a standoff that serves as an elongated nut
Union (plumbing), a pipe fitting
In numismatics
Union (coinage), a US gold coin that was worth $100 face value, it was never made because it would only be circulated among banks.
In mathematics and computer science
Union (set theory)
Union (SQL), an operator that combines the result of two SQL SELECT queries into a single result table
Union (computer science), a data structure that stores several types of data in the same location.
Union mount, a way to access separate file system directories as if they were but one.