The Collaborative International Dictionary of English v.0.48:
Directory \Di*rect"o*ry\, n.; pl. Directories.
1. A collection or body of directions, rules, or ordinances;
esp., a book of directions for the conduct of worship; as,
the Directory used by the nonconformists instead of the
2. A book containing the names and residences of the
inhabitants of any place, or of classes of them; an
address book; as, a business directory.
3. [Cf. F. directoire.] A body of directors; board of
management; especially, a committee which held executive
power in France under the first republic.
4. Direction; guide. [R.] --Whitlock.
The Free On-line Dictionary of Computing (30 December 2018):
A node in a hierarchical file system which
contains zero or more other nodes - generally, files or
The term "folder" is sometimes used in systems such as the
Macintosh or Microsoft Windows in which directories are
traditionally depicted as folders (like small briefcases).