vicennial

vi·cen·ni·al  (v-sn-l)

adj.

1. Happening once every 20 years.

2. Existing or lasting for 20 years.

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[From Late Latin vcennium, period of twenty years : Latin vcins, twenty times (from vgint, twenty; see vicenary) + Latin annus, year; see at- in Indo-European roots.]

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vicennial [vɪˈsɛnɪəl]

adj

1. occurring every 20 years

2. relating to or lasting for a period of 20 years

[from Late Latin vīcennium period of twenty years, from Latin vīciēs twenty times + -ennium, from annus year]

Thesaurus

Adj.

1.

vicennial - occurring once every 20 years