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Wiktionary
gaelscoil

n. (context Ireland English) A school in which Irish is the working language.

Wikipedia
Gaelscoil

A Gaelscoil (; plural: Gaelscoileanna) is an Irish-medium school in Ireland; the term refers especially to Irish-medium schools outside the Irish-speaking regions.

Students in the Gaelscoileanna acquire the Irish language through language immersion, and study the standard curriculum through it. Gaelscoileanna, unlike English-medium schools, have the reputation of producing competent Irish speakers. English-medium schools, in contrast, produce relatively few fluent Irish speakers, despite the Irish language being an obligatory subject in the Republic of Ireland in both primary and secondary school. This has been attributed in part to the lack of Irish-language immersion programs. The present government has promised reforms in curriculum and teaching training for Irish in English-medium schools.