# trigintennial

> English word · Adjective

## Definitions
1. Synonym of tricennial, once every thirty years.

## Etymology
From Latin triginta (“thirty”) + -ennial, combining adjectival form of annus (“year”). Compare the actual Latin term tricennium.

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