Sept 29, the feast of St Michael the archangel; in England, Ireland, and Wales, one of the four quarter days
WordReference Random House Unabridged Dictionary of American English © 2025
Mich•ael•mas
(mik′əl məs),USA pronunciation n. [Chiefly Brit.]
- Religion, British Termsa festival celebrated on September 29 in honor of the archangel Michael. Also called Mich′aelmas Day′.
- bef. 1150; Middle English Mighelmes; Old English (Sanct) Michaeles masse (St.) Michael's mass
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'Michaelmas' also found in these entries (note: many are not synonyms or translations):