decennium

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decennium

/dɪˈsɛnɪəm/ UK

Where it comes from

From Latin decennium, from decennis (“10-year”) + -ium (suffix forming abstract nouns), from deciēs (“ten times”) + annus (“year”) + -is (suffix forming compound adjectives). Equivalent to decennial + -ium.

noun decenniums · decennia

rare Synonym of decade: a ten year period. G.B. still has to cope with the heritage of approx. 20 years of consecutive Conservative reigns, just as you guys are getting your act together after almost a decennium of Enlightened Ronnie.
Similar: decade

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MLA

"decennium." Wiktionary, via Micwyn, micwyn.com/word/decennium. Accessed 6 Nov. 2026.

APA

decennium. (n.d.). In Wiktionary, via Micwyn. Retrieved November 6, 2026, from https://micwyn.com/word/decennium

Chicago

"decennium." Wiktionary, via Micwyn. Accessed November 6, 2026. https://micwyn.com/word/decennium.

BibTeX

@misc{decennium_2026,
  title = {decennium},
  howpublished = {Wiktionary, via Micwyn},
  year = {2026},
  url = {https://micwyn.com/word/decennium},
  urldate = {2026-11-06}
}