The Category is what is 'sighted' in words (the logos), which implies the articulation of an explicit description of the being of a given entity, rather than the covering over of that being of that entity with a name.
Category is the the action of a public accusation, asking someone to account for their actions in front of witnesses.
A Category is dependent on the assumption that reality can be studied by slicing it into parts and grouping those parts into sets, based on some perceived similarity between the parts. This slicing is not seen in terms of doing violence to the 'wholeness of reality' for the wholeness of reality is considered to be a mystery that needs to be taken apart and analyzed in order to be understood.
A Category is a mere form of thought which receives objective reality. It receives reality as phenomena, for it is only of phenomena that we are capable of a priori intuition.
A Category is necessarily determined by a particular kind of language and that particular language used lets everyone else see the object in terms of its Being.

Category is a kind of putting things on trial, making an entity account for the being of the entity itself, just as for the greeks, it was the the action of a public accusation, asking someone to account for their actions in front of witnesses.