Hello, I'm an expert in historical events and cultural references. The term "nine eleven" typically refers to the terrorist attacks that occurred on September 11, 2001, in the United States. On this date, a series of four coordinated attacks by the terrorist group al-Qaeda resulted in the destruction of the World Trade Center in New York City, the attack on the Pentagon, and the crash of United Airlines Flight 93. This tragic event is often simply referred to as "9/11."

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nine-eleven in British. 9-11 or 9/11. the 11th of September 2001, the day on which the twin towers of the World Trade Center in New York were flown into and destroyed by aeroplanes hijacked by Islamic fundamentalists. . Also called: September eleven.read more >>