day one

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

Origin:
1975–80

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Day one of our visit will close with a dinner with our traveling party.
It's also unique because it's the first mud volcano that scientists have
  observed from day one.
One day one of my co-teachers came into the teachers' office area with two
  small plastic containers.
They have known how damaging these drugs are from day one.
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