The annually recurring date of a past event, especially one of historical, national, or personal importance: a wedding anniversary; the anniversary of the founding of Rome.
A celebration commemorating such a date.
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.