Noun
the day in 2001 when Arab suicide bombers hijacked United States airliners and used them as bombs
Source: WordNetAs for September 11, let us not too easily grant the Americans possession of that date on the calendar. Like May 1 or July 14 or December 25, September 11 may seem full of significance to some people, while to other people it is just another day. J. M. Coetzee
Although September 11 was horrible, it didn't threaten the survival of the human race, like nuclear weapons do. Stephen Hawking
September 11 impressed upon us that life is a precious gift. Every life has a purpose. And I think we all have a duty to devote at least a small portion of our daily lives to ensuring that neither America nor the world ever forgets September 11. Bill Frist
As governor, I came to believe that the death penalty would be a just punishment for certain, especially heinous crimes, such as the murder of a child or the murder of a police officer. The events of September 11 convinced me that terrorists also deserve the ultimate punishment. Howard Dean
If the September 11 terror attack is supposed to constitute a caesura in world history, it must be able to stand comparison to other events of world historical impact. Jürgen Habermas
Some believe that those aeroplanes on September 11 came out of a clear blue sky. I believe they came out of a swamp of hatred created by us. George Galloway