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English definition of “9/11”

9/11

uk   /ˌnaɪn.ɪˈlev.ən/ mainly US us  
September the eleventh, written in US style: the date of the attacks on the World Trade Center and the Pentagon in the US in 2001: Since 9/11 there has been more cooperation between Russia and America.
(Definition of 9/11 from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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