9/11

• 911, 9-11, nine-eleven

From the date September 11 written in numbers according the format used in the United States, which puts the month before the day.

• IPA^(key): /naɪn.əˈlɛ.vən/

• Audio (US):

  (file)

• Rhymes: -ɛvən

9/11

2. September 11, 2001; The date of the attacks on the Twin Towers and the Pentagon in the United States.
4. (metonymic) The attacks themselves.
   • 2014 November 17, Roger Cohen, “The horror! The horror! The trauma of ISIS [print version: International New York Times, 18 November 2014, p. 9]”, in The New York Times‎^[1], archived from the original on 10 June 2021:

     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.

   • 2015 November 26, Claire Phipps, “New York Times slams 'outrageous' Donald Trump for mocking reporter's disability”, in The Guardian‎^[2], →ISSN, archived from the original on 26 March 2025:

     Republican front-runner twisted his arms in apparent imitation of Serge Kovaleski’s arthrogryposis as he reiterated controversial 9/11 claims

   • 2019 September 1, Claire Wardle, “Misinformation Has Created a New World Disorder”, in Scientific American‎^[3], archived from the original on 1 April 2025:

     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.

• The pronunciation /naɪn.wʌnˈwʌn/ ("nine-one-one") is usually used for the telephone number 911 instead of the date.

9/11 (plural 9/11s)

2. September 11, a date of the calender.
3. An event comparable to the September 11 attacks.
   • 2005, Peter H. Merkl, The Rift Between America And Old Europe: The Distracted Eagle, Routledge, page 73:

     Eleven million Spaniards responded to "their 9/11" by demonstrating in the rain against terrorism and their government's policies.

   • 2006 April 14, “Moussaoui says he wants more 9/11s”, in The Age‎^[4]:

     Moussaoui says he wants more 9/11s [title]

   • 2006, Michael Weissenstein, “Nations respond to their '9/11s'”, in International Institute for Strategic Studies‎^[5], archived from the original on 8 April 2008:

     But experts who have studied these other "9/11s" say some offer important revelations, by comparison, about how America responded to its own.

   • 2007, David E. Long, Bernard Reich, Mark Gasiorowski, The Government and Politics of the Middle East and North Africa:

     Jordanians referred to this horrific event as "their 9-11".

   • 2023 October 9, Ben Doherty, “Israel military says situation ‘dire’ in south as 260 bodies retrieved from festival”, in The Guardian‎^[6], →ISSN:

     IDF says fighting is ongoing in south, saying it ‘could be a 9/11 and a Pearl Harbour wrapped into one’ as Supernova festival-goers describe attack[.]

4. (Internet slang, humorous) A negative event that a person or a group of people have experienced whose impact is, hyperbolically, comparable to that of the September 11 attacks.

   This was my 9/11.

   9/11 for unfunny people

• September eleventh

• Roman Empire
• Appendix:American Dialect Society words of the year

• September 11 attacks on Wikipedia.Wikipedia

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