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day one

 - 3 dictionary results

day one

–noun
(often initial capital letters) the very first day or beginning of something.

Origin:
1975–80
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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day one  
n.   Informal
The very beginning; the first day: worked hard on the project from day one.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Slang Dictionary
day one

  1. n.
    the first day. (Often with since.) : You haven't done anything right since day one! You're fired!
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw Hill.
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