Definitions for day one
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Random House Webster's College Dictionary
day′ one′(n.)
(often caps.) the beginning; inception.
Category: Common Vocabulary
Origin of day one:
1975–80
Wiktionary
day one(Noun)
The very beginning
Citation
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"day one." Definitions.net. STANDS4 LLC, 2013. Web. 24 May 2013. <http://www.definitions.net/definition/day one>.

