
A system administrator, or sysadmin, is a person who is responsible for the upkeep, configuration, and reliable operation of computer systems; especially multi-user computers, such as servers. The system administrator seeks to ensure that the uptime, performance, resources, and security of the computers he or she manages meet the needs of the user...
Found on
http://en.wikipedia.org/wiki/System_administrator

A person who is responsible for keeping the servers available to users. These folk are specialists in the associated hardware and operating system of the platforms concerned. Hence 2003 and Linux system administrators.
Found on
http://www.ft.com/dbglossary
noun a person in charge of managing and maintaining a computer system of telecommunication system (as for a business or institution)
Found on
https://www.encyclo.co.uk/local/20974
No exact match found.