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noun
The day in 2001 when Arab suicide bombers hijacked United States airliners and used them as bombs.
synonyms: 9-11, 9/11, Sep 11, September 11.
is an instance of: terrorist attack.
is a part of: Sep, Sept, September.
domain category: act of terrorism, terrorism, terrorist act.
Find more on Sept. 11 elsewhere: etymology - rhymes - Wikipedia.
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