centennium

== English == === Etymology === From Late Latin centennium (“period of 100 years”), from centennis (“100-year”) + -ium (“forming abstract nouns”). Cognate with centennial. === Noun === centennium (plural centennia) (rare) Synonym of century: A period of 100 years. Coordinate terms: annum, biennium, triennium, quadrennium, quinquennium, sexennium, septennium, octennium, novennium, decennium, vicennium, tricennium, quincentennium, millennium, decamillennium, centimillennium, millionennium ==== Derived terms ==== quincentennium == Latin == === Etymology === From centennis (“100-year”) + -ium (“forming abstract nouns”). === Noun === centennium n (genitive centenniī or centennī); second declension (Late Latin) century: a period of 100 years ==== Declension ==== Second-declension noun (neuter). 1Found in older Latin (until the Augustan Age). ==== Descendants ==== → English: centennium, centennial