case
The term case means any proceeding over which a state or federal court has jurisdiction, including criminal prosecutions and civil actions. This term also includes grand jury investigations and related proceedings (such as motions to quash grand jury subpoenas and motions to compel testimony), applications for search warrants, and applications for electronic surveillance.
Source
28 CFR § 77.2
Scoping language
As used in this part, the following terms shall have the following meanings, unless the context indicates otherwise: