Quinquennial Definition

kwĭn-kwĕnē-əl, kwĭng-
adjective
Happening every five years.
Webster's New World
Lasting five years.
Webster's New World
noun

A fifth anniversary.

Wiktionary
A period of five years.
American Heritage

Other Word Forms of Quinquennial

Noun

Singular:
quinquennial
Plural:
quinquennials

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quinquennial