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

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

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

(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.

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

plural of operatorship