- a Celtic language that includes the speech of ancient Ireland and the dialects that have developed from it, especially those usually known as Irish, Manx, and Scottish Gaelic. Gaelic constitutes the Goidelic subbranch of Celtic.
- of or in Gaelic.
- of or relating to the Gaels or their language.
- any of the closely related languages of the Celts in Ireland, Scotland, or (formerly) the Isle of ManCompare Goidelic
- of, denoting, or relating to the Celtic people of Ireland, Scotland, or the Isle of Man or their language or customs