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Which is correct?

One in the same...


One and the same...

A quick google-vote says the former is "correct".

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A good reason not to rely on google-votes.... – Hellion Dec 13 '10 at 23:49
Who said the majority can't be wrong? ;) – user730 Dec 13 '10 at 23:57
Rule by the Mob... no matter how wrong they are! :) – Chris Dwyer Dec 14 '10 at 0:10
up vote 9 down vote accepted

The correct usage is "One and the same". A good dictionary or phrase compilation will confirm this. "One and the same" is used for emphasis, especially when there are seemingly different identities, characters, etc, in question. For example:

Johnny Jackson and the blind beggar in that corner are one and the same.

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@Chris: You should parse it as "emphasis by repetition"; the entities under consideration are (of) one (sort), and the entities under consideration are the same. – user730 Dec 13 '10 at 23:36

One and the same.

Citation: Reference.com

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I think both are correct. One and the same may be an older saying but one in the same makes perfect sense. Since it is commonly used I believe it to be correct.

Every phrase was created at some point so as long as it makes sense, it really can't be wrong.

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