Lady Day

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The feast of the Annunciation, celebrated on March 25.

from The Century Dictionary.

• noun The day on which is held the festival of the Annunciation of the Virgin Mary, March 25th. See annunciation.

from the GNU version of the Collaborative International Dictionary of English.

• noun The day of the annunciation of the Virgin Mary, March 25. See annunciation.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun 25th March, an English quarter day.
• noun 25th March, Christian holy day, the Annunciation of the Virgin Mary.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a festival commemorating the announcement of the Incarnation by the angel Gabriel to the Virgin Mary; a quarter day in England, Wales, and Ireland