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Verb: classify  'kla-si,fI
  1. Arrange or order by classes or categories
    "How would you classify these pottery shards--are they prehistoric?";
    - class, sort, assort, sort out, separate
  2. Declare unavailable, as for security reasons
    "Classify these documents"
  3. Assign to a class or kind
    "How should algae be classified?";
    - relegate

Derived forms: classified, classifies, classifying

Type of: assign, attribute, categorise [Brit], categorize, restrict

Antonym: declassify

Encyclopedia: Classify