[ blak-out ]
/ ˈblækˌaʊt /


Origin of blackout

First recorded in 1910–15; noun use of verb phrase black out

Can be confused

blackout brownout Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for blackout

British Dictionary definitions for blackout


/ (ˈblækaʊt) /


verb black out (adverb)

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medicine definitions for blackout


[ blăkout′ ]


Temporary loss of consciousness due to decreased blood flow to the brain.
Temporary loss of memory.

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Culture definitions for blackout


The complete loss of electrical power in a particular area. Blackouts can result from a natural disaster, a manmade catastrophe, or simply from an excess of energy demand over supply. (Compare brownout.)


Rolling blackouts to match supply and demand have become increasingly common in the United States.
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.