# September eleventh

> English word · Proper noun

## Definitions
1. The terrorist attacks that took place in the United States on September 11, 2001.

## Etymology
From September + eleventh.

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