classify
US /ˈklæs.ə.faɪ/
UK /ˈklæs.ə.faɪ/
1.
arrange (a group of people or things) in classes or categories according to shared qualities or characteristics.
:
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The books are classified by subject.
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We need to classify these documents before filing them.
2.
assign (something) to a particular class or category of restricted information.
:
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The government decided to classify the new intelligence report.
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This information is highly classified and cannot be shared.