An ancient Celtic harvest festival celebrated with dancing and bonfires.
The day on which this feast was held, usually August 1.
Origin of lunasa
- Irish (Lá) Lúnasa Lúnasa (Day) from Middle Irish Lughnasadh Lúnasa from Old Irish Lugnasad of obscure origin (but understood in Irish tradition as Lug the god Lug) (nassad, násad assembly, festival)
From American Heritage Dictionary of the English Language, 5th Edition