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closed S3

1 not open [= shut; ≠ open]:
Make sure all the windows are closed.
Make sure all the windows are closed.2 [not before noun] if a shop, public building etc is closed, it is not open and people cannot enter or use it [= shut; ≠ open]:
The shops here are closed on Sundays.
The shops here are closed on Sundays.3 restricted to a particular group of people [≠ open]:
4 not willing to accept new ideas or influences [≠ open]:
5 if something happens behind closed doors, it happens in private and the public are not allowed in :
It seems that the deal was made behind closed doors.
Football authorities ordered the club to play its next two games behind closed doors after the riots in February.
behind closed doors
It seems that the deal was made behind closed doors.
Football authorities ordered the club to play its next two games behind closed doors after the riots in February.6 a subject or problem that someone does not know about or understand :
Mathematics has always been a closed book to me.
a closed book (to somebody)
Mathematics has always been a closed book to me.7 a restricted group, or a group that cannot change or grow :
The law is not a closed set of rules and principles.
a closed set (of something)
The law is not a closed set of rules and principles.