9/11

Or 9-11

[nahyn-i-lev-uhn]

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.

9-11

1. See September 11 attacks.

Word History and Origins

Origin of 9-11¹

First recorded in 2000–05

Example Sentences

Last month, he attended a New York Yankees game on the 24th anniversary of the 9/11 attacks, and only one day after the killing of far-right activist and podcaster Charlie Kirk.

Read more on Salon

“What happened the last time we let Muslims learn how to fly planes on US soil!” she wrote on X, alluding to the 9/11 attacks.

Read more on The Wall Street Journal

He recalls being in New York after 9/11, unable to voice unease about the flag-waving and rush to war.

Read more on Los Angeles Times

“I took a principled stand,” he said, adding, “You don’t 9/11 your friends.”

Read more on Salon

These are similar powers to those applied to al-Qaeda after 9/11.

Read more on BBC