9-11 meaning

The date of the attack on the Twin Towers and the Pentagon in the USA, September 11th, 2001.
pronoun
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The attack itself.
pronoun
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An event comparable to 9/11.
noun
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1
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Origin of 9-11

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

    From Wiktionary