A year which is a multiple of one hundred (100) and marks that a century has past and changed to a new century (at the end of the year)

plural of century year

(astronomy, physics) A unit of length equal to the distance light travels in one century.

(politics, historical) The period of wars against the Qing dynasty and the succeeding Republic of China by Western countries and the Japanese Empire, lasting from 1839 to 1949.

The period from 1789 to 1914, beginning with the French Revolution and ending with the start of World War I.

(history) The period between 1914 and 1991; from the beginning of the First World War to the fall of the Soviet Union.

(history) The period from 1688 to 1815, beginning with the Glorious Revolution and ending with the Battle of Waterloo. / (history) The period from 1660 to 1830.