Categorization is the act of sorting and organizing things according to group, class, or, as you might expect, category. This noun is very similar in meaning to "assortment," "classification," and "compartmentalization."

When we discuss the differences between mammals and birds, or reptiles and amphibians, we are talking about the categorization of the animal kingdom. Another form of categorization is the way libraries shelve their books by subject, genre, and reading level. Rearranging all those books by color or size would be yet another kind of categorization, but not a very useful one for people wanting to check out lots of books about birds or reptiles.

Definitions of categorization
  1. noun
    the basic cognitive process of arranging into classes or categories
    synonyms: categorisation, classification, sorting
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    being of coordinate importance, rank, or degree
    appraisal, assessment
    the classification of someone or something with respect to its worth
    ascription, attribution
    assigning to a cause or source
    ascription, attribution
    assigning some quality or character to a person or thing
    cross-classification, cross-division
    classification according to more than one attribute at the same time
    incorporating something under a more general category
    critical analysis, critical appraisal
    an appraisal based on careful analytical evaluation
    the attribution of animal forms or qualities to a god
    the attribution of consciousness and personality to natural phenomena such as thunderstorms and earthquakes and to objects such as plants and stones
    the attribution to a source or cause
    externalisation, externalization
    attributing to outside causes
    evaluation, rating, valuation
    an appraisal of the value of something
    assay, check
    an appraisal of the state of affairs
    acid test
    a rigorous or crucial appraisal
    reappraisal, reassessment, revaluation, review
    a new appraisal or evaluation
    an appraisal that underestimates the value of something
    type of:
    basic cognitive process
    cognitive processes involved in obtaining and storing knowledge
  2. noun
    the act of distributing things into classes or categories of the same type
    synonyms: assortment, categorisation, classification, compartmentalisation, compartmentalization
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    the act of classifying and providing an index in order to make items easier to retrieve
    classifying something again (usually in a new category)
    the act of assigning (someone or something) to a particular class or category
    the act or process or arranging persons into classes or social strata
    practice of classifying plants and animals according to their presumed natural relationships
    classification according to general type
    type of:
    the activity of putting things together in groups
  3. noun
    a group of people or things arranged by class or category
    synonyms: categorisation, classification
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    dichotomy, duality
    being twofold; a classification into two opposed parts or subclasses
    being threefold; a classification into three parts or subclasses
    type of:
    an orderly grouping (of things or persons) considered as a unit; the result of arranging
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