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9/11

or 9-11

[nahyn-i-lev-uh n]
  1. September 11, 2001: the day on which Islamic terrorists, believed to be part of the Al-Qaeda network, hijacked four commercial airplanes and crashed two of them into the World Trade Center in New York City and a third one into the Pentagon in Virginia: the fourth plane crashed into a field in rural Pennsylvania.
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Also called nine-elev·en.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018