Remembrance Day

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

• noun A holiday in remembrance of those members of the armed services who died in war, observed by most members of the Commonwealth of Nations either on November 11 (and formerly known as Armistice Day) or on the second Sunday in November.

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

• proper noun chiefly UK The Sunday closest to November 11, observed in commemoration of the fallen in the two World Wars.
• proper noun Canada November 11, a federal holiday observed in commemoration of the fallen in the two World Wars and the Korean War.

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

• noun the Sunday nearest to November 11 when those who died in World War I and World War II are commemorated