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day one

noun
1.
(often initial capital letters) the very first day or beginning of something.
Origin of day one
1975-1980
1975-80
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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day one

noun phrase

The first day; the very beginning of something: You weren't happy doing this from day one

The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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Word Value for day

7
6
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