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Learner's Dictionary
day one
1 ENTRIES FOUND:
day one
(noun)
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day one
noun
or
Day One
day one
noun
or
Day One
Learner's definition of DAY ONE
[
singular
]
:
the first day or very beginning of something
We've known this about the project since/from
Day One
.
The new governor will start implementing these changes on
day one
. [=the first day of the governor's term]
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