Cognitive Linguistics
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Project Categorization
Aristotelian category
Category boundaries
Levels of categorization
Basic level
Category-wide attribute
Collective function
Subordinate level
Superordinate level
Parasitic categorization
Prototype category
Bad member
Degree of membership
Flexible adaptability
Goodness of exemplar
Good member
Informational density
Radial structure
Structural stability
Class inclusion
Degree of generality
Expert taxonomy
Folk taxonomy
Multiple parenting
Scientific taxonomy

Radial structure, or graded centraility, is a primary feature of a prototype category. It is a center-periphery taxonomy with the abstract or schematic prototype placed at the center. Those instances of category C that display the highest degree of C-ness are placed towards the center, and are more prototypical instances of category C, while those that display a low degree of C-ness are placed towards the periphery, and are less prototypical intances of category C (and are often also extensions of the category).


  • Lakoff, George (1987). Women, Fire, and Dangerous Things: What Categories Reveal about the Mind. Chicago: Chicago University Press.
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