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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. 2012.
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Link To day one

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Day one is always a great word to know.

So is callithumpian. Does it mean:

a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.

a stew of meat, vegetables, potatoes, etc.

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Slang Dictionary

day one definition

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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"Every day one should at least listen to a little song, read a good poem, look at a fine painting, and, if possible, say a few reasonable words."

-Johann Wolfgang Von Goethe

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