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To be at a high level or degree in particular field.

Expert
In my expertness, I believe you are unqualified for a position at this firm.
by Rantrx February 07, 2018
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When you meet with someone without anyone knowing except you and the person.
by Timbs March 08, 2017
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Expertness: (noun)
Person who is

more knowledgeable than anyone else
"excuse me for being incorrect, your Expertness"
by Smithereen March 24, 2019
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