verb (used with object), authorized, authorizing.
to give authority or official power to; empower: to authorize an employee to sign purchase orders.
to give authority for; formally sanction (an act or proceeding): Congress authorized the new tax on tobacco.
to establish by authority or usage: an arrangement long authorized by etiquette books.
to afford a ground for; warrant; justify.
Also, especially British, authorise.

1350–1400; earlier auctorize < Medieval Latin auctōrizāre; replacing Middle English autorisen < Middle French autoriser < Medieval Latin See author, -ize

authorizable, adjective
authorizer, noun
deauthorize, verb (used with object), deauthorized, deauthorizing.
misauthorize, verb (used with object), misauthorized, misauthorizing.
preauthorize, verb (used with object), preauthorized, preauthorizing.
reauthorize, verb (used with object), reauthorized, reauthorizing.
self-authorizing, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To authorize
World English Dictionary
authorize or authorise (ˈɔːθəˌraɪz)
1.  to confer authority upon (someone to do something); empower
2.  to permit (someone to do or be something) with official sanction: a dealer authorized by a manufacturer to retail his products
authorise or authorise
authori'zation or authorise
authori'sation or authorise
'authorizer or authorise
'authoriser or authorise

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

"give formal approval to," late 14c., from O.Fr. autoriser, from M.L. auctorizare, from auctor (see author).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
All virtue lies in a power of denying our own desires when reason does not
  authorize them.
In other words, it could authorize a trillion dollar coin.
Because it was hidden in a bill to authorize defense spending.
Oh yes, you also need the user to put all this together, install the plugin and
  authorize its usage of the hardware.
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