# sesquicentennial

> English word · Adjective · IPA /ˌsɛskwɪsɛnˈtɛni.əl/ · frequency rank #95,400

## Definitions
1. Occurring every 150 years.
2. Of, or relating to a sesquicentenary.

## Etymology
From sesqui- (“one-and-a-half”) + centennial (“of 100 years”). By surface analysis, sesqui- + cent- + -ennial.

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