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Wiktionary
first minister

n. 1 (context British Ireland English) The leader of the devolved governments of Wales, Scotland, or Northern Ireland. 2 (context Canada English) Any of the ten provincial premiers or the prime minister of Canada.

Wikipedia
First minister

A first minister is the leader of a government cabinet, usually now used to refer to the political leader of a subnational entity, such as the devolved administrations of Scotland, Wales, and Northern Ireland, or of a dependent territory.