September eleventh

proper noun

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

Similar
9/119-11
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Meanings

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

    Synonyms: 9/11, 9-11

Synonyms & antonyms

proper nounThe terrorist attacks that took place in the United States on September 11, 2001.

Similar
9/119-11
Also see
9/11september 11

Origin

From September + eleventh.

Full word history & related roots →
Cite this entry
APA

September eleventh. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/September%20eleventh

MLA

“September eleventh.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/September%20eleventh. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “September eleventh,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/September%20eleventh.

Source: September eleventh on Wiktionary, CC BY-SA 4.0.