circumscription

rajoittaminen the act of circumscribe circumscribing or the quality of being circumscribed
anything that circumscribes or a circumscribed area
puhekieltä 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.