In rem

From Latin, "against a thing."  Concerning the status of a particular piece of property. 

For instance, in-rem jurisdiction refers to the power of a court over an item of real or personal property.  The "thing" over which the court has power may be a piece of land or even a marriage.  Thus, a court with only in-rem jurisdiction may terminate a marriage or declare who owns a piece of land.  In-rem jurisdiction is based on the location of the property and enforcement follows property rather than person.

Contrast: In personam

See Jurisdiction, Injunction, Civil procedure