(slang, computing) A rogue system administrator who abuses users of the system.

(differential geometry) A generalization of the Laplace operator; the anticommutator of the exterior derivative and the codifferential.

(telecommunications) A provider of mobile telecommunications who does not operate any physical network infrastructure, but relies on contracting with physical mobile telecom network infrastructure operators to provide mobility access.

(historical) A Canadian democratic socialist political party active between 1932 and 1961 which served as the predecessor of the New Democratic Party.

The office of an operator / The right to operate an oil well

plural of operatorship