administrator

[ad-min-uh-strey-ter]
noun
1.
a person who manages or has a talent for managing.
2.
Law. a person appointed by a court to take charge of the estate of a decedent, but not appointed in the decedent's will.
3.
Also called Informal, admin. Computers.
a.
a person who manages and supports a computer system or network, as in a business or other organization: the company’s system administrator; a database administrator. Compare system operator.
b.
a person who manages an Internet discussion group or other interactive website: a forum administrator.
c.
a user account on a home computer accessible only by the user who manages the computer system. Compare root1 ( def 11b ).
d.
a user who has access to this user account.

Origin:
1400–50; late Middle English < Latin administrātor, equivalent to administrā(re) (see administer) + -tor -tor

administratorship, noun
preadministrator, noun
subadministrator, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
administrator (ədˈmɪnɪˌstreɪtə)
 
n
1.  a person who administers the affairs of an organization, official body, etc
2.  property law a person authorized to manage an estate, esp when the owner has died intestate or without having appointed executors
3.  a person who manages a computer system
 
adminis'tratrix
 
fem n

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

administrator
1510s, from L. administrator, agent noun from pp. stem of administrare (see administer). Estate sense is earliest. For ending, see -er.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Under a free government the citizen makes his own laws, chooses his own
  administrators, which do represent him.
Her unladylike demeanor and unorthodox methods led to friction with some of her
  colleagues and university administrators.
Administrators exist to facilitate and support the work of professors with
  students.
Some aid administrators are asking the department for help in catching the
  runners.
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