# pentennial

> English word · Adjective

## Definitions
1. Synonym of quinquennial: occurring every five years.

## Etymology
From Ancient Greek πέντε (pénte, “five”) + Latin annus (“year”) + -ial.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/pentennial