Meaning of “classified” in the English Dictionary

"classified" in American English

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us /ˈklæs·əˌfɑɪd/

(Definition of “classified” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"classified" in Business English

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uk /ˈklæsɪfaɪd/ us

classified documents and information are officially kept secret and can only be seen by people who have high authority or special permission:

Security employees discovered that classified information and passwords had been leaked onto the internet.
He was caught taking highly classified documents from the National Archives.

[ before noun ] relating to the small advertisements in newspapers, magazines, or on websites that offer jobs or to sell or buy things:

The help-wanted classified sections are overflowing with ads for managers.

used to describe information that is arranged by type:

Classified data will increase 50% a year as more economies begin using broadband technology.
The classified catalogue tells you which publications on a particular subject are available in the library.

(Definition of “classified” from the Cambridge Business English Dictionary © Cambridge University Press)