unionist

One who believes in or supports labor unions.

A member of a labor union.

One who is loyal to the United Kingdom, especially in support of its sovereignty over Northern Ireland.

One who was loyal to the federal government of the United States during the Civil War.

One who promotes or advocates union.

A member of a trade-union; a trade-unionist. One who during the American civil war took the side of the national government.

[capitalized] In British politics, one who is opposed to the dissolution or rupture of the legislative union existing between Great Britain and Ireland, and especially to the separatist principles and tendencies of those who desire to establish home rule in Ireland: a name applied to the Conservatives and Liberal Unionists.

Of or pertaining to a union or to unionism; promoting or advocating union: as, a unionist movement; a unionist party.