classify

/ˈklæsɪfaɪ/
verb
  1. To arrange or organize things into groups based on shared characteristics.
    • We need to classify these documents by date.
    • The librarian will classify the new books by genre.
    • Biologists classify animals into species and genera.
  2. To mark information as secret or restricted for security reasons.
    • Only authorized personnel can classify documents as top secret.
    • The government decided to classify the report for national security.
    • They had to classify the data to prevent leaks.
Antonyms
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