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vicennial

American

[vahy-sen-ee-uhl] / vaɪˈsɛn i əl /

adjective

of or for 20 years.
occurring every 20 years.

vicennial British

/ vɪˈsɛnɪəl /

adjective

occurring every 20 years
relating to or lasting for a period of 20 years

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of vicennial

1730–40; < Latin vīcenni ( um ) twenty-year period ( vīc ( ēnī ) twenty each + -enn ( us ), combining form of annus year + -ium -ium ) + -al ¹

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023