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911

[ nahyn-wuhn-wuhn, nahyn-i-lev-uhn ]
/ ˈnaɪnˌwʌnˈwʌn, ˈnaɪn ɪˈlɛv ən /
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(in the U.S. and Canada) a telephone number used to reach emergency services, as the police, the fire department, or an ambulance.
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Origin of 911

First recorded in 1965–70

Other definitions for 911 (2 of 2)

9/11

or 9-11

[ nahyn-i-lev-uhn ]
/ ˈnaɪn ɪˈlɛv ən /

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.
Also called nine-eleven .
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

How to use 911 in a sentence

Cultural definitions for 911

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.
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