9/11

American  

[nahyn-i-lev-uhn] / ˈnaɪn ɪˈlɛv ən /

Or 9-11

1. 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.

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9-11 Cultural  

1. See September 11 attacks.

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Etymology

Origin of 9/11

First recorded in 2000–05

Example Sentences

Mr. Bush came to the realization—and only after 9/11, remember—that vicious rulers and their failed states generate disaffected people who harbor ill designs on the United States.

From The Wall Street Journal

Weeks after I arrived, 9/11 happened and, of course, the mood changed.

From The Wall Street Journal

Not that he hadn’t done such writing before, but something about the granular nature of the evidence relating to 9/11 made me curious about how it would come out.

From The Wall Street Journal

The firm’s name appears on websites hunting for people suffering from video game addiction, exposure to toxins from 9/11, and toe implant failure.

From Los Angeles Times

He not only reported on the front-line fighting but also won exclusive, and controversial, interviews with then-President Saddam Hussein and future 9/11 mastermind Osama bin Laden.

From Los Angeles Times