The customary length of a mile in Ireland, 2240 yards (approx. 2048 metres) (now historical); (now chiefly informal) a long distance; an indeterminate or unfixed distance.
Origin
Late 16th century; earliest use found in Richard Stanyhurst (1547–1618), literary scholar and translator.
Definition of Irish mile in US English:
Irish mile
noun
The customary length of a mile in Ireland, 2240 yards (approx. 2048 metres) (now historical); (now chiefly informal) a long distance; an indeterminate or unfixed distance.
Origin
Late 16th century; earliest use found in Richard Stanyhurst (1547–1618), literary scholar and translator.