admin

Short definition from Wiktionary

Noun

1. 1
   Administration, or administrative work.
2. 2
   An administration (a body that administers; the executive part of government).
3. 3
   The administrative or managerial body of a company or other organization.
4. 4
   An administrator (one who administers affairs).
5. 5
   A systems administrator (one who maintains a computer system or network).
6. 6
   A user of a discussion forum, website, etc. with privileges allowing them to control or restrict the activity of other users.

Verb

1. 1
   To serve as an administrator for or of.