someone who administers a business
"The new administrator streamlined the company's operations to boost productivity."
the party appointed by a probate court to distribute the estate of someone who dies without a will or without naming an executor
"The local judge named my aunt as administrator since her uncle passed away without leaving a will."
someone who manages a government agency or department
"The new administrator announced major reforms for the state environmental protection agency at her first press conference."
One who administers affairs; one who directs, manages, executes, or dispenses, whether in civil, judicial, political, or ecclesiastical affairs; a manager
"The Administrator opened the parliamentary session on behalf of the monarch while residing in Canberra."
The queen's representative in some Commonwealth territories, comparable to a Governor General.
In plain English: An administrator is someone who manages and takes care of the daily operations of an organization or system.
"The new administrator announced changes to the school schedule during the morning meeting."
Usage: Do not use this term for the royal representative; instead, reserve it for someone who manages an organization, system, or group. It refers to the person with overall responsibility for administration and operations rather than a specific governmental title.
The word administrator comes from the Latin administrātor, which literally meant "one who attends closely." It entered English as a doublet, sharing its origin with the related term administrator.