circumscription

The act of circumscribing or the quality of being circumscribed.

Anything that circumscribes or a circumscribed area.

The definition of what does and does not belong to a given taxon, from a particular taxonomic viewpoint or taxonomic system.

The circumscription in the APG system of the family Malvaceae includes the former families Bombacaceae, Sterculiaceae and Tiliaceae.

An electoral district; used often in texts treating electoral systems in Romance countries.