English dictionary september 11 meaning and definition Definition and meaning of september 11 at MeaningMonkey.org. september 11 meaning and definition in the English Dictionary. SEPTEMBER 11 nounDefinition of September 11 (noun)the day in 2001 when Arab suicide bombers hijacked United States airliners and used them as bombssynonyms: 9/11, Sep 11, Sept. 11 Source: Princeton University Wordnet
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