1. The plural of classification; the act or process of arranging things into groups or categories based on shared characteristics.
2. A system or scheme for organizing items, concepts, or organisms into ordered groups or classes.
3. Official designations or ratings assigned to documents, information, or materials to indicate their level of secrecy or restricted access.
Usage: often used in government and military contexts

Examples

• The library uses several different classifications to organize its books.
• Scientists developed new classifications for the species discovered in the rainforest.
• The document received a top-secret classification and could only be viewed by authorized personnel.
• Job classifications help determine salary levels and benefits.
• The classifications of plants include kingdom, phylum, class, order, family, genus, and species.
• These classifications make it easier for students to understand how animals are related to each other.