classified
US /ˈklæs.ə.faɪd/
UK /ˈklæs.ə.faɪd/

1.
officially declared secret, especially for reasons of national security.
:
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The documents are highly classified and cannot be released to the public.
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Access to the classified information requires special clearance.
2.
(of a newspaper or magazine advertisement) falling into a particular category.
:
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I saw your ad in the classified section of the newspaper.
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She placed a classified ad for a used car.
1.
arrange (a group of people or things) in classes or categories according to shared qualities or characteristics.
:
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The librarian classified the books by genre.
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We need to classified these specimens for further study.