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Definition of anniversary
noun (plural anniversaries)
the date on which an event took place in a previous year:the 50th anniversary of the start of World War II [as modifier]:anniversary celebrations the date on which a country or other institution was founded in a previous year:Canada’s 125th anniversary the date on which a couple was married in a previous year:he even forgot our tenth anniversary! informal the date on which a romance began in a previous month or week.
with a double n
at the beginning; the ending is -ary