1. Also called Decoration Day. a day, May 30, set aside in most states of the U.S. for observances in memory of dead members of the armed forces of all wars: now officially observed on the last Monday in May.
2. any of several days, as April 26, May 10, or June 3, similarly observed in various Southern states.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.