OPERATION

noun Etymology: Middle English operacioun, from Middle French ~, from Latin ~-, operatio, from operari Date: 14th century performance of a practical work or of something involving the practical application of principles or processes, 2. an exertion of power or influence , the quality or state of being functional or operative , a method or manner of functioning , efficacy , potency , a procedure performed on a living body usually with instruments especially for the repair of damage or the restoration of health, any of various mathematical or logical processes (as addition) of deriving one entity from others according to a rule, 6. a usually military action, mission, or maneuver including its planning and execution, the office on the flight line of an airfield where pilots file clearance for flights and where flying from the field is controlled, the agency of an organization charged with carrying on the principal planning and operating functions of a headquarters and its subordinate units, a business transaction especially when speculative, a single step performed by a computer in the execution of a program, a usually small business or establishment