Definitions from Wordnet 2.0

• the activity of operating something (a machine or business etc.); "her smooth operation of the vehicle gave us a surprisingly comfortable ride"
• a planned activity involving many people performing various actions; "they organized a rescue operation"; "the biggest police operation in French history"; "running a restaurant is quite an operation"; "consolidate the companies various operations"
• a process or series of acts especially of a practical or mechanical nature involved in a particular form of work; "the operations in building a house"; "certain machine tool operations"
• a medical procedure involving an incision with instruments; performed to repair damage or arrest disease in a living body; "they will schedule the operation as soon as an operating room is available"; "he died while undergoing surgery"
• (mathematics) calculation by mathematical methods; "the problems at the end of the chapter demonstrated the mathematical processes involved in the derivation"; "they were learning the basic operations of arithmetic"
• activity by a military or naval force (as a maneuver or campaign); "it was a joint operation of the navy and air force"
• a business especially one run on a large scale; "a large-scale farming operation"; "a multinational operation"; "they paid taxes on every stage of the operation"; "they had to consolidate their operations"
• (psychology) the performance of some composite cognitive activity; an operation that affects mental contents; "the process of thinking"; "the cognitive operation of remembering"
• (computer science) data processing in which the result is completely specified by a rule (especially the processing that results from a single instruction); "it can perform millions of operations per second"
• process or manner of functioning or operating; "the power of its engine determine its operation"; "the plane''s operation in high winds"; "they compared the cooking performance of each oven"; "the jet''s performance conformed to high standards"
• the state of being in effect or being operative; "that rule is no longer in operation"

Definitions from Wiktionary

• a business especially one run on a large scale; "a large-scale farming operation"; "a multinational operation"; "they paid taxes on every stage of the operation"; "they had to consolidate their operations" ,
• a planned activity involving many people performing various actions; "they organized a rescue operation"; "the biggest police operation in French history"; "running a restaurant is quite an operation"; "consolidate the companies various operations" ,
• a process or series of acts especially of a practical or mechanical nature involved in a particular form of work; "the operations in building a house"; "certain machine tool operations" ,
• the state of being in effect or being operative; "that rule is no longer in operation" ,
• a medical procedure involving an incision with instruments; performed to repair damage or arrest disease in a living body; "they will schedule the operation as soon as an operating room is available"; "he died while undergoing surgery" ,
• activity by a military or naval force (as a maneuver or campaign); "it was a joint operation of the navy and air force" ,
• (computer science) data processing in which the result is completely specified by a rule (especially the processing that results from a single instruction); "it can perform millions of operations per second" ,
• process or manner of functioning or operating; "the power of its engine determine its operation"; "the plane's operation in high winds"; "they compared the cooking performance of each oven"; "the jet's performance conformed to high standards" ,
• (mathematics) calculation by mathematical methods; "the problems at the end of the chapter demonstrated the mathematical processes involved in the derivation"; "they were learning the basic operations of arithmetic" , 10. (psychology) the performance of some composite cognitive activity; an operation that affects mental contents; "the process of thinking"; "the cognitive operation of remembering" , 1
• the activity of operating something (a machine or business etc.); "her smooth operation of the vehicle gave us a surprisingly comfortable ride"

• Operation: Operation may refer to: Scientific operation Surgery , or operation. An operation in mathematics: Unary operation Binary operation ...
• Military operation: Military operation is the coordinated military actions of a state in response to a developing situation. These actions are designed as a ...
• Binary operation: In mathematics , a binary operation is a calculation involving two operands , in other words, an operation whose arity is two. ...
• Operation (mathematics): The general operation as explained on this page should not be confused with the more specific operator s on vector space s. arithmetic operation . ...
• Operations management: Operations management is an area of management concerned with overseeing, designing, and redesigning business operations in the production ...
• Sting operation: In law enforcement, a sting operation is a deceptive operation designed to catch a person committing a crime. A typical sting will have a ...
• Covert operation: A covert operation (also as CoveOps or covert ops) is a military , intelligence or law enforcement operation that is carried ...

• Fed’s Lockhart: No Need to Extend Operation Twist - Wall Street Journal
  It isn’t necessary to extend the Federal Reserve‘s Operation Twist beyond its scheduled expiration in June and a severe drop-off in the U.S. economy would be needed for it to implement further quantitative easing, said the head of the ... Read more on this news related to 'Operation'
• CoreLogic® Recognizes Operation HOPE for 20 Years of Empowering Underserved Communities - Yahoo Finance
  SANTA ANA, Calif. and LOS ANGELES, May 21, 2012 /PRNewswire/ -- CoreLogic (CLGX), a leading provider of information, analytics and business services, recently joined Operation HOPE (HOPE) to celebrate its 20th Anniversary and "silver rights ... Read more on this news related to 'Operation'
• AT&T Launches 2012-2013 Operation Hand Salute - Yahoo Finance
  DALLAS, May 16, 2012 /PRNewswire/ -- AT&T* announced today the launch of the 2012-2013 Operation Hand Salute (OHS), its groundbreaking supplier diversity program designed to mentor and develop Service Disabled Veteran Owned Business Enterprises ... Read more on this news related to 'Operation'