vigintennial
English
editEtymology
editFrom viginti- (“twenty”) + -ennial (“yearly”), from Latin vīgintī (“twenty”) and -enniālis, from annus (“year”) + -is (“forming compound adjectives”) + -ālis (“-al: forming adjectives”).
Adjective
editvigintennial (not comparable)
References
edit- “vigintennial, adj.”, in OED Online , Oxford, Oxfordshire: Oxford University Press, launched 2000.