1. • noun - the state of being in effect or being operative
   • noun - a business especially one run on a large scale
   • noun - a planned activity involving many people performing various actions
   • noun - (computer science) data processing in which the result is completely specified by a rule (especially the processing that results from a single instruction)
   • noun - activity by a military or naval force (as a maneuver or campaign)
   • noun - a medical procedure involving an incision with instruments
   • noun - a process or series of acts especially of a practical or mechanical nature involved in a particular form of work
   • noun - process or manner of functioning or operating
   • noun - (psychology) the performance of some composite cognitive activity
   • noun - (mathematics) calculation by mathematical methods
   • noun - the activity of operating something (a machine or business etc.)
2. • The act or process of operating or functioning.
   • The state of being operative or functional: a factory in operation.
   • A process or series of acts involved in a particular form of work: the operation of building a house.
   • An instance or a method of efficient, productive activity: That restaurant is quite an operation.
   • An unethical or illegal business: a fencing operation for stolen goods.
   • A surgical procedure for remedying an injury, an ailment, a defect, or a dysfunction.
   • A process or an action, such as addition, substitution, transposition, or differentiation, performed in a specified sequence and in accordance with specific rules.
   • An action resulting from a single instruction.
   • A military or naval action, campaign, or mission.

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