1. arranges or organizes things into categories or groups based on shared characteristics
Usage: third person singular present tense of ‘classify’
2. designates information as secret or restricted for security purposes
Usage: government or military context

Examples

• The librarian classifies books according to subject matter.
• The scientist classifies the specimens by species.
• The system automatically classifies emails as spam or legitimate.
• The government classifies sensitive documents to protect national security.
• She classifies her expenses into different budget categories.
• The teacher classifies students into reading groups based on ability level.