[ noun ] honoring the archangel Michael; a quarter day in England, Wales, and Ireland <noun.time>
Michaelmas \Mich"ael*mas\, n. [Michael + mass religious service; OE. Mighelmesse.] The feast of the archangel Michael, a church festival, celebrated on the 29th of September. Hence, colloquially, autumn.
{Michaelmas daisy}. (Bot.) See under {Daisy}.
Ambitious gardeners have even been known to hot-bed their Michaelmas daisies.