SYSADMIN Meaning of SYSADMIN in English sys ‧ ad ‧ min /ˈsɪsˌædmən, ˈsɪsˌædmɪn/ BrE AmE noun [countable] technical a ↑ system administrator Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012