I. Unionism noun [uncountable]
the principles of those people in Northern Ireland, mainly Protestants, who want Northern Ireland to remain as part of the UK. There are several political parties that support these principles, including the Ulster Unionists and the Democratic Unionist Party. ⇒ compare republicanism

[TahlilGaran] Dictionary of Contemporary English ▲

II. See main entry: Unionist

[TahlilGaran] Dictionary of Contemporary English ▲

u‧nion‧is‧m /ˈjuːnjənɪzəm/ noun [uncountable]
belief in the principles of trade unions
—unionist noun [countable]

[TahlilGaran] Dictionary of Contemporary English ▲