a person who manages or has a talent for managing.
Law. a person appointed by a court to take charge of the estate of a decedent, but not appointed in the decedent's will.
Also called Informal, admin. Computers.
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.
a person who manages an Internet discussion group or other interactive website: a forum administrator.
a user account on a home computer accessible only by the user who manages the computer system. Compare root1 ( def 11b ).
a user who has access to this user account.

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

administratorship, noun
preadministrator, noun
subadministrator, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
administrator (ədˈmɪnɪˌstreɪtə)
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
fem n

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

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
He seems to have embraced the transition to administrator enthusiastically.
Chris works as a housing admissions administrator at a nearby college and
  teaches art sculpture.
He is, in theory an administrator of a budget that he screwed up in a public
  fashion and therefore unfit to administer his budget.
Morale declines, and ultimately productivity with it, until the administrator
  is finally shown the door-or promoted.
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