Categorisation

[Magaret]

the process of putting people or things into categories (= groups with the same features) :

[Miltensl]

the act of distributing things into classes or categories of the same type

[BertababySog]

a group of people or things arranged by class or category

[Larrysaelek]

Categorization is the ability and activity of recognizing shared features or similarities between the elements of the experience of the world (such as objects, events, or ideas), organizing and classifying experience by associating them to a more abstract group (that is, a category, class, or type), on the basis of their traits, features, similarities or other criteria that are universal to the group. Categorization is considered one of the most fundamental cognitive abilities, and as such it is studied particularly by psychology and cognitive linguistics.
Categorization is sometimes considered synonymous with classification (cf., Classification synonyms). Categorization and classification allow humans to organize things, objects, and ideas that exist around them and simplify their understanding of the world. Categorization is something that humans and other organisms do: doing the right thing with the right kind of thing. The activity of categorizing things can be nonverbal or verbal. For humans, both concrete objects and abstract ideas are recognized, differentiated, and understood through categorization. Objects are usually categorized for some adaptive or pragmatic purposes.
Categorization is grounded in the features that distinguish the categorys members from nonmembers. Categorization is important in learning, prediction, inference, decision making, language, and many forms of organisms interaction with their environments.

[Carmellabita]

the basic cognitive process of arranging into classes or categories