| verb | arrange or order by classes or categories “How would you classify these pottery shards--are they prehistoric?” |
| verb | declare unavailable, as for security reasons “Classify these documents” |
| verb | assign to a class or kind “How should algae be classified?” |
| classificatory | adjective | relating to or involving classification: |
| class | noun | a league ranked by quality |
| classification | noun | a group of people or things arranged by class or category |
| classifier | noun | a person who creates classifications |
| sort | noun | a category of things distinguished by some common characteristic or quality |
| sorter | noun | a clerk who sorts things (as letters at the post office) |
| sorting | noun | an operation that segregates items into groups according to a specified criterion |
| assortment | noun | the act of distributing things into classes or categories of the same type |
| relegation | noun | the act of assigning (someone or something) to a particular class or category |