officer

[aw-fuh-ser, of-uh-]
noun
1.
a person who holds a position of rank or authority in the army, navy, air force, or any similar organization, especially one who holds a commission.
2.
a member of a police department or a constable.
3.
a person licensed to take full or partial responsibility for the operation of a merchant ship or other large civilian ship; a master or mate.
4.
a person appointed or elected to some position of responsibility or authority in the government, a corporation, a society, etc.
5.
(in some honorary orders) a member of any rank except the lowest.
6.
Obsolete. an agent.
verb (used with object)
7.
to furnish with officers.
8.
to command or direct as an officer does.
9.
to direct, conduct, or manage.

Origin:
1275–1325; Middle English < Anglo-French; Middle French officier < Medieval Latin officiārius, equivalent to Latin offici(um) office + -ārius -ary; see -er2, -ier2

officerial [aw-fuh-seer-ee-uhl, of-uh-] , adjective
officerless, adjective
officership, officerhood, noun
subofficer, noun
underofficer, noun
unofficered, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
officer (ˈɒfɪsə)
 
n
1.  a person in the armed services who holds a position of responsibility, authority, and duty, esp one who holds a commission
2.  See police officer
3.  (on a non-naval ship) any person including the captain and mate, who holds a position of authority and responsibility: radio officer; engineer officer
4.  a person appointed or elected to a position of responsibility or authority in a government, society, etc
5.  a government official: a customs officer
6.  (in the Order of the British Empire) a member of the grade below commander
 
vb
7.  to furnish with officers
8.  to act as an officer over (some section, group, organization, etc)

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

officer
early 14c., from O.Fr. officer, from M.L. officarius, from L. officium (see office). The military sense is first recorded 1560s. Applied to petty officials of justice from 16c.; U.S. use in ref. to policemen is from 1880s.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
There will not be a police officer there at the crucial moment.
So it seemed to be an individual tic of an aggressive police officer rather
  than a system-wide policy.
In his spare time he volunteered as a reserve police officer for the city.
Learn about the basic officer certification for law enforcement officers.
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