from
The Collaborative International Dictionary of English v.0.48
911 \9/11\ (n[imac]n" [-e]*l[e^]v"[e^]n) n.
September 11, 2001 -- the day when two airplanes hijacked by
Islamic terrorists were deliberately crashed into the "twin
towers" (the two 110-storey skyscrapers of the World Trade
Center) in New York City, causing those buildings to collapse
and much other damage in the nearby area. Another plane was
crashed into the Pentagon near Washington. In total, the
attacks caused nearly 3,000 deaths. This was the worst
incident of terrorism inside the United States to date. The
abbreviated date 9/11 is now taken to refer to that specific
day and the terrorist incidents that occured that day. It is
used especially in the phrase "the events of 9/11".
[PJC]