Dictionary

9/11 en · PROPN

Pronunciation

• (US) audio
• /ˌnaɪn.əˈlɛ.vən/

Etymology

From the date September 11 written numerically with the notation used in the United States, in the month–day format.

Meanings

1. September 11, 2001; The date of the attacks on the World Trade Center and the Pentagon in the United States.
2. (metonymically) The attacks themselves.
   • As someone who studies the impact of misinformation on society, I often wish the young entrepreneurs of Silicon Valley who enabled communication at speed had been forced to run a 9/11 scenario with their technologies before they deployed them commercially. 2019 September 1, Claire Wardle, “Misinformation Has Created a New World Disorder”, in Scientific American, archived from the original on 01 Apr 2025:
   • What is unbearable, in fact, is the feeling, 13 years after 9/11, that America has been chasing its tail; that, in some whack-a-mole horror show, the quashing of a jihadi enclave here only spurs the sprouting of another there; that the ideology of Al Qaeda is still reverberating through a blocked Arab world whose Sunni-Shia balance (insofar as that went) was upended by the American invasion of Iraq. 2014 November 17, Roger Cohen, “The horror! The horror! The trauma of ISIS”, in The New York Times, New York, N.Y.: The New York Times Company, →ISSN, →OCLC, archived from the original on 10 Jun 2021:
   • Republican front-runner twisted his arms in apparent imitation of Serge Kovaleski’s arthrogryposis as he reiterated controversial 9/11 claims 2015 November 26, Claire Phipps, “New York Times slams 'outrageous' Donald Trump for mocking reporter's disability”, in The Guardian, London: Guardian News & Media, →ISSN, →OCLC, archived from the original on 26 Mar 2025:

Forms

Synonyms

September eleventh · September eleventh

Translations (18)

de 11. September (September 11 attacks) · tr onbir eylül (September 11 attacks) · pt Onze de Setembro (September 11 attacks) · pt 11 de Setembro (September 11 attacks) · es 11S (September 11 attacks) · ja 9・11 (September 11 attacks) · cmn 九一一事件 (September 11 attacks) · da 11. september (September 11 attacks) · fi WTC-isku (September 11 attacks) · hi ९/११ हमले (September 11 attacks) · ja アメリカ同時多発テロ (September 11 attacks) · tr 11 eylül (September 11 attacks) · cmn 9·11事件 (September 11 attacks) · es 11-S (September 11 attacks) · pl 11 września (September 11 attacks) · fr 11 septembre (September 11 attacks) · sv 11 september-attackerna (September 11 attacks) · hi ९/११ (9/11) (September 11 attacks)

wikipedia: Two World Trade Center · wikipedia: Date and time notation in the United States · wikipedia: United Airlines Flight 175