# sesquicentenary

> English word · Noun

## Definitions
1. A 150-year anniversary.

## Etymology
From sesqui- (“one and a half”) + centenary (“100 year anniversary”).

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