directory

(dĭ-rĕkˈtə-rē, dī-)

1. A book containing an alphabetical or classified listing of names, addresses, and other data, such as telephone numbers, of specific persons, groups, or firms.
2. Computer Science
   a. A listing of the files contained in a storage device, such as a magnetic disk.
   b. A description of the various characteristics of a file, such as the layout of the fields in it.
3. A book of rules or directions.
4. A group or body of directors.