Etymology

centennium

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Today it means: Synonym of century: A period of 100 years. Full definition →

Late Latin centennium
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The story

  1. Late Latin · borrowed fromcentennium“period of 100 years”
  2. English todaycentennium

From Late Latin centennium (“period of 100 years”), from centennis (“100-year”) + -ium (“forming abstract nouns”). Cognate with centennial.

Etymology from Wiktionary, CC BY-SA 4.0.