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Definition of 9/11 noun from the Oxford Advanced American Dictionary



NAmE//ˌnaɪn ɪˈlɛvn//
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the abbreviation for the date September 11, 2001, when terrorists flew planes into the World Trade Center in New York, the Pentagon in Washington, D.C., and a field in Pennsylvania, killing thousands of people
See the Oxford Advanced Learner's Dictionary entry: 9/11

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