Meaning of “9/11” in the English Dictionary

british dictionary

"9/11" in British English

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uk /ˌnaɪn.ɪˈlev.ən/ us /ˌnaɪn.ɪˈlev.ən/ mainly 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 Learner’s Dictionary & Thesaurus © Cambridge University Press)