The fact of operating or being active:The way that parts of a machine or system work….Learn more.Definition of operation noun in oxford advanced american dictionary.Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.When a patient has an operation, a surgeon cuts open their body in order to remove, replace, or repair a diseased or damaged part.Charles was at the clinic recovering from an operation on his arm.
What Are They Hiding? John F. Kennedy and Martin Luther King Jr
What Are They Hiding? John F. Kennedy and Martin Luther King Jr

What Are They Hiding? John F. Kennedy and Martin Luther King Jr of Operation Disclosure Official: They're Hiding THIS From You! Wake Up America! .

1
By 
There are 18 meanings listed in oed's entry for the noun operation, four of which are labelled obsolete.See ‘meaning & use’ for definitions, usage, and quotation evidence.An act or instance, process, or manner of functioning or operating.See examples of operation used in a sentence.Operation can refer to medical surgery, a military campaign, or mathematical methods, such as multiplication and division.Operation comes from the latin word opus (“work”) and can refer to a …The meaning of operation is performance of a practical work or of something involving the practical application of principles or processes.How to use operation in a sentence.