noun Chiefly British.
- a festival celebrated on September 29 in honor of the archangel Michael.
- Sept 29, the feast of St Michael the archangel; in England, Ireland, and Wales, one of the four quarter days
early 12c., Sanct Micheles mæsse, the feast of St. Michael (Sept. 29, an English quarter-day), from Michael + mass (n.2). Goose is the day’s traditional fare since at least 15c.