1. The basic cognitive process of arranging into classes or categories
   "The librarian's categorisation of books made them easy to find";
   - classification, categorization, sorting
    
2. The act of distributing things into classes or categories of the same type
   "The librarian's categorisation of books made them easier to find";
   - categorization, classification, compartmentalization, compartmentalisation [Brit], assortment
    
3. A group of people or things arranged by class or category
   "The library used a detailed categorisation system for organizing books";
   - classification, categorization

Derived forms: categorisations

Type of: arrangement, basic cognitive process, grouping

Encyclopedia: Categorisation