—n. 1. a book containing an alphabetical index of the names and addresses of persons in a city, district, organization, etc., or of a particular category of people.
2. a board or tablet on a wall of a building listing the room and floor numbers of the occupants.
3. a book of directions.
4. Computers. a. a list of files contained in external storage.
b. a description of characteristics of a particular file, as the layout of fields within each record.
5. the Directory,Fr. Hist.the body of five directors forming the executive power of France from 1795 to 1799.