1
as in confidence
information shared only with another or with a select few
you didn't really expect him to keep a secret from his wife, did you?
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2
as in mystery
something hard to understand or explain
the secrets of the Egyptian pyramids include the construction methods used to lift the huge blocks of stone in place
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3
as in key
something that allows someone to achieve a desired goal
the secret to advancement in this company is hard work and dedication
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1
as in clandestine
undertaken or done so as to escape being observed or known by others
a secret operation to rescue captive soldiers behind enemy lines
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2
as in undercover
working on missions in which one's objectives, activities, or true identity are not publicly revealed
secret agents whose wartime exploits were known only by top government officials
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3
4
as in confidential
not known or meant to be known by the general populace
proprietary information that the company does its best to keep secret
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Merriam-Webster unabridged
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