- of or for 20 years.
- occurring every 20 years.
Origin of vicennial
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- occurring every 20 years
- relating to or lasting for a period of 20 years
C18: from Late Latin vīcennium period of twenty years, from Latin vīciēs twenty times + -ennium, from annus year