Definition from macmillandictionary.com
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All the doors are closed and locked.
Keep your eyes tightly closed.
All the shops were closed.
This part of the museum is closed to the public.
Cases of this type are tried in a closed military court.
The meeting was held in closed session.
a closed society
You can’t approach these kind of situations with a closed mind.
a closed question
The law is not a closed set of rules and principles.
a closed loop of wire