Anniversary vs. Birthday

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.’;

Birthdaynoun

The anniversary of the day on which someone is born.

Anniversarynoun

(especially) Such a day that commemorates a wedding.

‘We are celebrating our tenth anniversary today.’;

Birthdaynoun

The anniversary of the day on which something is created.

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).

Birthdaynoun

The date on which someone is born or something is created, more commonly called birthdate or date of birth.

Anniversaryadjective

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

Birthdayverb

To celebrate one's birthday.

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.

Birthdaynoun

The day in which any person is born; day of origin or commencement.

‘Those barbarous ages past, succeeded nextThe birthday of invention.’;

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.

Birthdaynoun

The day of the month in which a person was born, in whatever succeeding year it may recur; the anniversary of one's birth.

‘This is my birthday; as this very dayWas Cassius born.’;

Anniversarynoun

The celebration which takes place on an anniversary day.

Birthdayadjective

Of or pertaining to the day of birth, or its anniversary; as, birthday gifts or festivities.

Anniversarynoun

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

Birthdaynoun

an anniversary of the day on which a person was born (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’;

Birthdaynoun

the date on which a person was born

Anniversarynoun

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

‘he even forgot our tenth anniversary!’;

Birthdaynoun

the anniversary of the day on which a person was born, typically treated as an occasion for celebration and the giving of gifts

‘his twenty-ninth birthday’; ‘a birthday cake’;

Anniversarynoun

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

Birthdaynoun

the day of a person's birth

‘he shares a birthday with Rod Stewart’;

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.

Birthdaynoun

the anniversary of something's origin or foundation

‘the seventy-fifth birthday of the Institute’;

Birthday

A birthday is the anniversary of the birth of a person, or figuratively of an institution. Birthdays of people are celebrated in numerous cultures, often with birthday gifts, birthday cards, a birthday party, or a rite of passage.