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Added 10 October 2026

decennial

/dɪˈsɛnɪəɫ/ noun

Latin root: decennialis Wiktionary

noun Definition from Wiktionary (CC BY-SA). Pronunciation from Wiktionary, via Kaikki.org. More about decennial at Wordnik → Where our words come from →

Synonym of decade, a ten-year period.
A tenth anniversary, particularly Synonym of decennalia, the festival and religious ritual held in the 10th year of a Roman emperor's reign.
Synonym of decennalia, the festival and religious ritual held in the 10th year of a Roman emperor's reign.

adjective

Occurring every ten years.
Of or related to a ten-year period, as a term of office.

Origin

From Latin decennialis, from decennium (“10-year period”) + -ālis, from decennis (“10-year”) + -ium (“-ium”, suffix forming abstract nouns), from decem (“ten”) + annus (“year”) + -is (suffix forming compound adjectives).

From Wiktionary, via Kaikki.org (CC BY-SA)

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