authorization granted to do something; formal consent: to ask permission to leave the room.
the act of permitting.

1400–50; late Middle English < Latin permissiōn- (stem of permissiō) a yielding, giving leave, equivalent to permiss(us) (past participle of permittere to permit) + -iōn- -ion

permissioned, adjective
permissory [per-mis-uh-ree] , adjective
nonpermission, noun
self-permission, noun

acquiescence, permission.

1. leave, sanction.

1. restraint, refusal. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
permission (pəˈmɪʃən)
authorization to do something

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

c.1410, from L. permissionem (nom. permissio), from permissus, pp. of permittere (see permit).
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

permission definition

file system
(Or "file mode") The ability to access (read, write, execute, traverse, etc.) a file or directory. Depending on the operating system, each file may have different permissions for different kinds of access and different users or groups of users.
chmod ("change mode") is the UNIX command to change permissions.

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
He never received permission from the ethics board to use human subjects.
They grant permission to search for fossils-for now.
When his firm decided to go natural, he asked the garden's owners for
  permission to make their landscape sustainable as well.
Under the law, a landlord may not unreasonably withhold permission for a tenant
  to sublet his apartment two years out of any four.
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