Definitions from Wiktionary (decennial)

▸ noun:  Synonym of decade, a ten-year period.
▸ noun:  A tenth anniversary, particularly
▸ noun:  (historical) Synonym of decennalia, the festival and religious ritual held in the 10th year of a Roman emperor's reign.
▸ adjective:  Occurring every ten years.
▸ adjective:  Of or related to a ten-year period, as a term of office.





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