Noun

(centuries)

A period of 100 consecutive years; often specifically'' a numbered period with conventional start and end dates, e.g., the ''twentieth century'', which stretches from (''strictly'') 1901 through 2000, or (''informally'') 1900 through 1999. The ''first century AD was from 1 to 100; a yearhundred.

* {{quote-book, year=1963, author=(Margery Allingham)

, title=(The China Governess), chapter=Foreword citation , passage=He stood transfixed before the unaccustomed view of London at night time, a vast panorama which reminded him […] of some wood engravings far off and magical, in a printshop in his childhood. They dated from the previous century and were coarsely printed on tinted paper, with tinsel outlining the design.}}

* {{quote-magazine, date=2013-07-20, volume=408, issue=8845, magazine=(The Economist)

, title= The attack of the MOOCs , passage=Since the launch early last year of […] two Silicon Valley start-ups offering free education through MOOCs, massive open online courses, the ivory towers of academia have been shaken to their foundations. University brands built in some cases over centuries have been forced to contemplate the possibility that information technology will rapidly make their existing business model obsolete.}}

A unit in ancient Roman army, originally of 100 army soldiers as part of a cohort, later of more varied sizes (but typically containing 60 to 70 or 80) soldiers or other men (guards, police, firemen), commanded by a centurion.

A political division of ancient Rome, meeting in the Centuriate Assembly.

(archaic)  A hundred things; a hundred.

*, II.4.2.i:

'tis the subject of whole books: I might cite a century of authors pro'' and ''con .

(cricket)  A hundred runs scored either by a single player in one innings, or by two players in a partnership.

(cycling)  A ride 100 kilometres in length.

(US, informal)  A banknote in the denomination of one hundred dollars.

Noun

(en noun)

The anniversary of the day on which someone is born.

* 1867 , , Chapter 2: Treats Of Oliver Twist's Growth, Education, And Board,

Oliver Twist's ninth birthday found him a pale thin child, somewhat diminutive in stature, and decidedly small in circumference.

* 1903', '', The Fifth Surprise: The Monarch Celebrates His ' Birthday ,

One of the Wise Men said the King was born in February; another declared it was in May, and a third figured the great event happened in October. So the King issued a royal decree that he should have three birthdays' every year, in order to be on the safe side; and whenever he happened to think of it he put in an odd ' birthday or two for luck.

* 1906 , , Chapter 9: The pride of Perks,

"And we thought we'd make a nice birthday for him. He's been so awfully jolly decent to us, you know, Mother," said Peter, "and we agreed that next bun-day we'd ask you if we could."

* (editor), Diary of Cotton Mather , Volume 1: 1681-1708, footnote, page 1,

It was his custom to begin a new year's record on February 12, his birthday .

* 1921 June 4, ,

The King's Birthday , which occurred yesterday, will be officially observed to-day, and the customary list of honours conferred on the occasion is published.

The anniversary of the day on which something is created.

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