Decoration Day

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

• noun A former name for Memorial Day.

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

• United States a day, May 30, originally appointed for decorating with flowers the graves of the Union soldiers and sailors, who fell in the Civil War in the United States; -- now called Memorial Day, and established as the last Monday in May, and designated as a day for commemorating those who died in all wars of the United States.

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

• noun legal holiday in the United States, last Monday in May; commemorates the members of the United States armed forces who were killed in war