vigentennial

adjective
vi·​gen·​ten·​ni·​al | \ ¦vījen‧¦tenēəl\

Definition of vigentennial

 (Entry 1 of 2)

: occurring once every 20 years : relating to a 20th anniversary

vigentennial

noun
\ "\
plural -s

Definition of vigentennial (Entry 2 of 2)

: a 20th anniversary or its celebration

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History and Etymology for vigentennial

Adjective

Latin vigeni, viceni twenty each + English -tennial (as in centennial)

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