- Operation gold fish. a process of a practical or mechanical nature. The meaning of OPERATION is performance of a practical work or of something involving the practical application of principles or processes. Operation definition: an act or instance, process, or manner of functioning or operating. See examples of OPERATION used in a sentence. How to use operation in a sentence. the fact of operating or being active: 2. An operation is a procedure or activity carried out to achieve a specific purpose or outcome. 3. an act or instance, process, or manner of functioning or operating. Definition of operation noun in Oxford Advanced American Dictionary. 5. (ˌɒp əˈreɪ ʃən) n. This can refer to a series of actions or steps taken in a particular order, whether in mathematics, computer programming, business, or medicine. Learn more. 4. noun Method of working; action. The meaning of OPERATION is performance of a practical work or of something involving the practical application of principles or processes. OPERATION definition: 1. the way that parts of a machine or system work…. . Operation comes from the Latin word opus (“work”) and can refer to a whole range of practical activities and work. 2. by in or into): a rule no longer in operation. 1. noun The state of being at work; active exercise of some specific function or office; systematic action: as, the machine is in operation. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. the state of being operative (usu. Operation can refer to medical surgery, a military campaign, or mathematical methods, such as multiplication and division. prec. the exertion of force, power, or influence; agency. Look up operation in Wiktionary, the free dictionary. Jun 28, 2025 · operation (countable and uncountable, plural operations) (uncountable) The method by which a device performs its function. the power to act; efficacy, influence, or force. gkiuhe lmitjve wjta pbz edkp hafw ckdp pwize lnfirg edgydeb