vicennals

== English == === Etymology === From Latin vīcennālia, from vīcennis (“20-year”) + -ālia (“-alia: forming festival names”), from vīciēs (“twenty times”) + annus (“year”) + -is (“forming compound adjectives”). === Noun === vicennals pl (plural only) (historical, rare) Synonym of vicennalia: the festival and religious ritual held on the 20th anniversary of a Roman emperor's reign. === References === “vicennals, n.”, in OED Online ⁠, Oxford: Oxford University Press, launched 2000.