- a person whose activities or beliefs are characterized by unionism.
- a member of a trade union.
- a supporter of the federal union of the United States of America, especially during the Civil War.
- (formerly) an upholder of the legislative union of Great Britain and Northern Ireland.
- a supporter or advocate of unionism or union
- a member of a trade union
- of or relating to union or unionism, esp trade unionism
- (sometimes not capital)
- (before 1920) a supporter of the union of all Ireland and Great Britain
- (since 1920) a supporter of union between Britain and Northern Ireland
- a supporter of the US federal Union, esp during the Civil War
- of, resembling, or relating to Unionists
