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9/11

[nahyn--i-lev-uhn]
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.
Also, 9-11.
Also called nine-eleven.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
9/11

noun
the day in 2001 when Arab suicide bombers hijacked United States airliners and used them as bombs 
WordNet® 3.0, © 2006 by Princeton University.
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