"categorization" in the noun sense
1. classification, categorization, categorisation
a group of people or things arranged by class or category
2. classification, categorization, categorisation, sorting
the basic cognitive process of arranging into classes or categories
3. categorization, categorisation, classification, compartmentalization, compartmentalisation, assortment
the act of distributing things into classes or categories of the same type
Source: WordNet® (An amazing lexical database of English)
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