noun, adj — 5 senses
UK /dɪˈsɛnɪəɫ/
Etymology 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).
Synonym of decade, a ten-year period.
A tenth anniversary, particularly
Historical Synonym of decennalia, the festival and religious ritual held in the 10th year of a Roman emperor's reign.
Etymology 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).
Occurring every ten years.
Of or related to a ten-year period, as a term of office.
Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.