- the hour or moment at which a military attack or other important operation is to begin
- any crucial or decisive moment
Origin of zero hour
so called because it marks the end of an actual or implied countdownzero hour
zero hourWebster's New World College Dictionary, Fifth Edition Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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"Zero hour." YourDictionary. LoveToKnow. www.yourdictionary.com/zero-hour.
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Zero hour. (n.d.). In YourDictionary. Retrieved from https://www.yourdictionary.com/zero-hour
zero hour
noun
The scheduled time for the start of an operation or action, especially a combat operation of great size. Also called H-hour .
THE AMERICAN HERITAGE® DICTIONARY OF THE ENGLISH LANGUAGE, FIFTH EDITION by the Editors of the American Heritage Dictionaries. Copyright © 2016, 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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Cite this page
MLA Style
"Zero hour." YourDictionary. LoveToKnow. www.yourdictionary.com/zero-hour.
APA Style
Zero hour. (n.d.). In YourDictionary. Retrieved from https://www.yourdictionary.com/zero-hour
English Wiktionary. Available under CC-BY-SA license.
Link to this page
Cite this page
MLA Style
"Zero hour." YourDictionary. LoveToKnow. www.yourdictionary.com/zero-hour.
APA Style
Zero hour. (n.d.). In YourDictionary. Retrieved from https://www.yourdictionary.com/zero-hour
