# centennium

> English word · Noun

## Definitions
1. Synonym of century: A period of 100 years.

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

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/centennium