[dih-rek-tuh-ree, -tree, dahy-]
noun, plural directories.
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.
a board or tablet on a wall of a building listing the room and floor numbers of the occupants.
a book of directions.
Also called folder. an organizing unit in a computer's file system for storing and locating files. In a hierarchical file system, directories can contain child directories (subdirectories) as well as files.
a description of characteristics of a particular file, as the layout of fields within each record.
the Directory, French History. the body of five directors forming the executive power of France from 1795 to 1799.
serving to direct; directing; directive.

1400–50; late Middle English < Medieval Latin dīrēctōrium, noun use of Late Latin dīrēctōrius directorial; in def. 5, translation of French Directoire < Medieval Latin, as above Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
directory (dɪˈrɛktərɪ, -trɪ, daɪ-)
n , pl -ries
1.  a book, arranged alphabetically or classified by trade listing names, addresses, telephone numbers, etc, of individuals or firms
2.  a book or manual giving directions
3.  a book containing the rules to be observed in the forms of worship used in churches
4.  a less common word for directorate
5.  computing an area of a disk, Winchester disk, or floppy disk that contains the names and locations of files currently held on that disk
6.  directing

Directory (dɪˈrɛktərɪ, -trɪ, daɪ-)
history Also known as: the French Directory the body of five directors in power in France from 1795 until their overthrow by Napoleon in 1799

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

mid-15c. (adj.), from L. directorius; as a noun, 1540s, from M.L. directorium, noun use of neut. of directorius, from directus (see direct). Meaning "alphabetical listing of inhabitants of a region" is from 1732; listing of telephone numbers is from 1908.
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

directory definition

file system
A node in a hierarchical file system which contains zero or more other nodes - generally, files or other directories.
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).

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
Place a phone directory book between the furnace and your hand.
Entirely good and understandably maintained snare directory.
It's also the largest b2b green directory on the web.
But to industry diehards, the correct pronunciation of the style directory is
  as important as the right shoe.
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