911

[ nahyn-wuhn-wuhn, nahyn-i-lev-uhn ]
See synonyms for 911 on Thesaurus.com
  1. (in the United States and Canada) the telephone number used to reach emergency medical, fire, and police services.

Origin of 911

1
First recorded in 1965–70

Other definitions for 9/11 (2 of 2)

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.

Origin of 9/11

2
First recorded in 2000–05
  • Also called nine-eleven .

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024

Cultural definitions for 9-11

9-11

The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.