Etymology
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Michaelmas (n.)

early 12c., Sanct Micheles mæsse, the feast of the dedication of St. Michael the Archangel (Sept. 29), from Michael + mass (n.2). It was an English quarter day in the old business and university calendars. Goose is the day's traditional fare at least since 15c.

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Definitions of Michaelmas

Michaelmas (n.)
honoring the archangel Michael; a quarter day in England, Wales, and Ireland;
Synonyms: Michaelmas Day / September "
From wordnet.princeton.edu