In semantic memory, the groupings or clusters of objects and concepts that occur naturally in the world (that is, groups of objects that resemble one another and share common features and uses, as distinct from artificial categories such as MAMMAL, which rely on a technical definition for category membership):

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Natural categories refer to groupings or clusters of objects and concepts that occur naturally in the world, where the objects within a category share common features and uses. This contrasts with artificial categories that are defined by specific technical criteria.

In Semantic Memory, the Groupings or Clusters of Objects and Concepts