What does "decennium" mean?

Synonym of decade: a ten year period.

What is a synonym for "decennium"?

Common synonyms include: decade, annum, century, day, decade, decennary.

Decennium

//dɪˈsɛnɪəm// noun

noun ·Uncommon ·Advanced level

Definitions

Noun

1
Synonym of decade: a ten year period. rare
"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."
2
a period of 10 years wordnet

Synonyms

All synonyms

decade annum century day decade decennary

Example

More examples

"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."

Etymology

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.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.