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Noun operation  has 11 senses
operation - 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"--1 is a kind of transaction, dealing, dealings; business activity, commercial activity; transaction, dealing, dealings; business activity, commercial activity
 
operation - 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"--2 is a kind of activity; activity
 --2 has particulars: rescue operation; undercover operation
 
operation, procedure - 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"--3 is a kind of work; work
 
operation - the state of being in effect or being operative; "that rule is no longer in operation"--4 is a kind of action, activity, activeness; action, activity, activeness
 --4 has particulars: commission; running
 
operation, surgery, surgical operation, surgical procedure, surgical process - 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"--5 is a kind of medical procedure; medical procedure
 --5 has parts: 
--5 has particulars:
 |  | ablation, extirpation, cutting out, excision; amputation; angioplasty; arthroplasty; arthroscopy; brain surgery; castration; cautery, cauterization, cauterisation; chemosurgery; craniotomy; cryosurgery; curettage, curettement; debridement; decortication; dilation and curettage, dilatation and curettage, D and C; electrosurgery; enterostomy, enterotomy; enucleation; wrong-site surgery; evisceration; exenteration; fenestration; gastrectomy; gastroenterostomy; gastrostomy; heart surgery; hemorrhoidectomy, haemorrhoidectomy; hysterotomy; implantation; iridectomy; iridotomy; intestinal bypass; jejunostomy; major surgery; microsurgery; minor surgery; myotomy; myringectomy; myringoplasty; myringotomy; neurosurgery; orchiopexy; osteotomy; ostomy; palatopharyngoplasty, PPP, uvulopalatopharyngoplasty, UPPP; phlebectomy; photocoagulation; plastic surgery, reconstructive surgery, anaplasty; polypectomy; resection; rhinotomy; rhizotomy; sex-change operation, transsexual surgery; Shirodkar's operation, purse-string operation; sterilization, sterilisation; strabotomy; taxis; tracheostomy, tracheotomy; transplant, transplantation, organ transplant; trephination; tympanoplasty; uranoplasty; vasovasostomy; vivisection | 
operation, military operation - activity by a military or naval force (as a maneuver or campaign); "it was a joint operation of the navy and air force"--6 is a kind of activity; activity
 --6 has particulars:
 |  | combined operation; maneuver, manoeuvre, simulated military operation; campaign, military campaign; naval campaign; mission, military mission; support, reinforcement, reenforcement; attack, onslaught, onset, onrush; offense, offence, offensive; peacekeeping, peacekeeping mission, peacekeeping operation; amphibious operation; information gathering; psychological operation, psyop; covert operation; Meuse, Meuse River, Argonne, Argonne Forest, Meuse-Argonne, Meuse-Argonne operation; Operation Desert Storm | 
operation - (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"--7 is a kind of data processing; data processing
 --7 has particulars:
 |  | access, memory access; asynchronous operation; auxiliary operation, off-line operation; boolean operation, binary operation, binary arithmetic operation; computer operation, machine operation; concurrent operation; control operation, control function; dyadic operation; fixed-cycle operation; logic operation, logical operation; monadic operation, unary operation; multiplex operation; parallel operation, simultaneous operation; printing operation; search, lookup; serial operation, sequential operation, consecutive operation; sort, sorting; synchronous operation; threshold operation | 
operation, functioning, performance - 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"--8 is a kind of process; process
 
mathematical process, mathematical operation, operation - (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"--9 is a kind of calculation, computation, computing; calculation, computation, computing
 --9 has particulars:
process, cognitive process, mental process, operation, cognitive operation - (psychology) the performance of some composite cognitive activity; an operation that affects mental contents; "the process of thinking"; "the cognitive operation of remembering"--10 is a kind of cognition, knowledge, noesis; cognition, knowledge, noesis
 --10 has particulars: basic cognitive process; higher cognitive process
 
operation - the activity of operating something (a machine or business etc.); "her smooth operation of the vehicle gave us a surprisingly comfortable ride"--11 is a kind of activity; activity
 
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