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| 9/11 [ nn i lévvən ] or 9-11 [ nn i lévvən ] |
noun |
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| Definition: |
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1. events of September 11, 2001: the events of September 11, 2001, when planes hijacked by terrorists destroyed the World Trade Center in New York, damaged the Pentagon, and crashed into a field in Pennsylvania, with great loss of life
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2. terrorist attack with many casualties: any catastrophic attack, e.g., by terrorists, on a country, locale, or building, where very large numbers of innocent victims are killed or injured
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