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


Usage notes[edit]

  • /naɪn.wʌnˈwʌn/ is usually used for the telephone number 911 instead of the date.

Alternative forms[edit]

Proper noun[edit]


  1. The date of the attack on the Twin Towers and the Pentagon in the USA, September 11th, 2001.
  2. The attack itself.



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, The Age[1]
      Moussaoui says he wants more 9/11s
    • 2006, Michael Weissenstein, "Nations respond to their '9/11s'"[2]
      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 ".

See also[edit]