What does categorising mean?
Categorising is the act of organising people, objects, ideas, or information into distinct classes or groups based on shared features. It is the present participle of the verb "categorise", which derives ultimately from the Greek "katēgoria", meaning assertion or predication, via Latin and French. The word is standard in British English, while American English typically uses the spelling "categorizing". In practice, categorising is fundamental to how knowledge is structured: librarians categorise books by subject, scientists categorise species, and analysts categorise data to make it interpretable. Its register is largely neutral and functional, appearing constantly in academic, professional, and everyday settings. However, when applied to human beings, categorising can take on a subtly critical edge, implying that complex individuals are being reduced to simplistic labels. Related terms include classification and taxonomy, and the word pairs naturally with activities such as sorting, filing, and grouping.
Arranging or sorting things into classes or categories according to their shared characteristics; the ongoing action of categorising.
"He is currently categorising the museum's insect specimens by order and family."
British spelling; American English uses "categorizing".
The process or activity of sorting things into categories, viewed as an action or concept in itself.
"Careful categorising is essential before any meaningful data analysis can begin."
Every time you sort your inbox or shelve books by genre, you're performing a mental act the ancient Greeks gave a name to over two thousand years ago.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of categorising
The word traces back through the verb "categorise", which entered English in the seventeenth century, to the Greek "katēgoria" meaning assertion or predication, coined by Aristotle in his treatise on the Categories. Greek "katēgoria" passed into Latin as "categoria" and then into French before reaching English, where "category" came to mean a class or division of things. The verb form "categorise" was later formed directly from the noun "category", and "categorising" is its progressive form, spelled with an s in British English and with a z ("categorizing") in American English. Its cognates include "categorical" and "categorisation".
Related word forms
How categorising is actually used
"Categorising" is chiefly the British English spelling; American usage prefers "categorizing". The verb carries a neutral register but can acquire a mildly negative connotation when applied to people, where rigid sorting may suggest stereotyping or oversimplification. It appears frequently in academic, scientific, and administrative contexts.
Easily confused with categorising
"Categorizing" with a z is the American English spelling of the same word, while "categorising" with an s is the British spelling.