someone appointed by a court to manage the business and property of a company during administration (=efforts made to avoid a business having to close when it has run into financial difficulties)
Swindon have asked their administrator for more time to make payments, which also include a £900,000 final instalment in June 2007.
someone appointed by a court who collects and distributes a deceased's (=dead person's) assets
If your mother is not mentally capable of amending her will before she dies you will have to apply to be appointed administrator of the estate.
someone who manages the operation of a business, organisation or plan etc
She works as an administrator at the University of Kent.