vicennial

== English == === Etymology === From vicennium +‎ -al or directly from Latin vīcenniālis, from vīcennium (“20-year span”) + -ālis (“-al”, adjective-forming suffix), from vīcennis (“20-year”) + -ium (“-ium”, suffix forming abstract nouns), from vīciēs (“20 times”) + annus (“year”) + -is (suffix forming compound adjectives). Equivalent to vice- (“twenty”) + -ennial. === Adjective === vicennial (not comparable) Occurring once every twenty years. Lasting for twenty years. ==== Synonyms ==== vigintennial ==== Related terms ==== annual (yearly), biennial (2), triennial (3), quadrennial (4), quinquennial (5), sexennial (6), septennial (7), octennial (8), novennial (9), decennial (10), centennial (100), bicentennial (200), quincentennial (500), millennial (1000), decamillennial (10,000), perennial (forever) ==== Translations ==== === Noun === vicennial (plural vicennials) A twenty-year period A twentieth anniversary, particularly 1909 June, John H. Vincent & al., "'89's Vicennial", The Chautauquan, Vol. 55, No. 1, p. 130: Among the well established anniversaries celebrated by Chautauqua classes from year to year are the vicennials. A strong sense of comradeship is developed among members who come to Chautauqua twenty years after graduation... (historical) Synonym of vicennalia, the festival and religious ritual held in the 20th year of a Roman emperor's reign. 2022, Martin Hallmannsecker, Roman Ionia..., p. 110: Roman coins mentioning the vota publica for Macrinus are RIC IV.1 5–13; on vota publica for the decennials and vicennials of emperors in the 2nd and 3rd c. ad, see Chastagnol 1984. ==== Usage notes ==== In reference to the Roman festival, sometimes used in the plural to match Latin vicennalia and provide for the variety of events. ==== Coordinate terms ==== (Roman festival): decennial, tricennial === References === “vicennial, adj.”, in OED Online ⁠, Oxford: Oxford University Press, launched 2000.