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See also: 911, 9・11, and 9-1-1


English Wikipedia has an article on:
The north face of Two World Trade Center (south tower) immediately after being struck by United Airlines Flight 175

Alternative forms[edit]


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/
  • (file)
  • Rhymes: -ɛvən

Usage notes[edit]

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

Proper noun[edit]


  1. The date of the attack on the Twin Towers and the Pentagon in the USA, September 11th, 2001.
  2. (metonymically) The attack itself.
    • 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]:
      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.



9/11 (plural 9/11s)

  1. An event comparable to 9/11.
    • 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[2]:
      Moussaoui says he wants more 9/11s [title]
    • 2006, Michael Weissenstein, “Nations respond to their '9/11s'”, in International Institute for Strategic Studies[3], archived from the original on 2008-04-08:
      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[4], →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[.]


See also[edit]

Further reading[edit]