(business) A corporate officer of a corporation, company, or agency, responsible for executing decisions of the chief executive officer (CEO) according to their decided schedule; often initialised as COO.

(computing) Any simple operation, such as addition, multiplication or division, performed on floating point numbers using a single operation.

A period during which a telecommunications service remains in an operational state.

(computing) A logical operator that returns a value as soon as the outcome is certain, without necessarily testing all operands (for example, an OR operator returning true if the first operand evaluates as true, without evaluating the second operand).

Alternative spelling of short circuit operator

(accounting) Income after deducting operating expenses but before deducting for income taxes, interest, and depreciation and amortization.

(UK, rail transport) A company that operates passenger trains on the mainline railway network in Great Britain under franchise or license from the Government.

plural of train operating company

plural of freight operating company

(UK, rail transport) A company that runs freight trains on the national railway network in Great Britain under license from the government.