Anniversary vs. Decennial

Anniversarynoun

A day that is an exact number of years (to the day) since a given significant event occurred. Often preceded by an ordinal number indicating the number of years.

‘Today is the fiftieth anniversary of the end of the war.’;

Decennialnoun

The tenth anniversary of an event or happening.

Anniversarynoun

(especially) Such a day that commemorates a wedding.

‘We are celebrating our tenth anniversary today.’;

Decennialadjective

Occurring every ten years.

Anniversarynoun

A day subsequent in time to a given event by some significant period other than a year (especially as prefixed by the amount of time in question).

Decennialadjective

Of or related to a ten-year period, as a term of office.

Anniversaryadjective

Returning with the year, at a stated time; annual; yearly; as, an anniversary feast.

Decennialadjective

Consisting of ten years; happening every ten years; as, a decennial period; decennial games.

Anniversarynoun

The annual return of the day on which any notable event took place, or is wont to be celebrated; as, the anniversary of the Declaration of Independence.

Decennialnoun

A tenth year or tenth anniversary.

Anniversarynoun

The day on which Mass is said yearly for the soul of a deceased person; the commemoration of some sacred event, as the dedication of a church or the consecration of a pope.

Anniversarynoun

The celebration which takes place on an anniversary day.

Anniversarynoun

the date on which an event occurred in some previous year (or the celebration of it)

Anniversarynoun

the date on which an event took place or an institution was founded in a previous year

‘the 75th anniversary of the RAF’; ‘the 50th anniversary of the Battle of Britain’;

Anniversarynoun

the date on which a couple were married in a previous year

‘he even forgot our tenth anniversary!’;

Anniversarynoun

the date on which a romance began in a previous month or week.

Anniversary

An anniversary is the date on which an event took place or an institution was founded in a previous year, and may also refer to the commemoration or celebration of that event. For example, the first event is the initial occurrence or, if planned, the inaugural of the event.