Definition of 9-11 - WordReference.com Dictionary

WordReference.com English Dictionary

9-11
A	noun
	1	9/11, 9-11, September 11, Sept. 11, Sep 11
			the day in 2001 when Arab suicide bombers hijacked United States airliners and used them as bombs
		Category Tree: act; human action; human activity ╚activity ╚operation; military operation ╚attack; onslaught; onset; onrush ╚surprise attack; coup de main ╚terrorist attack ╚9/11, 9-11, September 11, Sept. 11, Sep 11

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9/11 times two
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