"To define the category" means to establish the specific characteristics or qualities that make something fit into a particular group or classification. Full definition
However, the appetite appears to be one for a more cautious approach, perhaps with a pilot scheme in a clearly defined category of claim. (newlawjournal.co.uk)
Android O introduces notification channels to provide a unified system to help users manage notifications with app - defined categories for notification content. (xda-developers.com)
It is supposed that to be a man is to fall under certain clearly defined categories such that we know quite well the structure of the existence so designated. (religion-online.org)