|1.||[ noun ] the state of being in effect or being operative|
"that rule is no longer in operation"
|Related terms:||action commission running engage|
|2.||[ noun ] (business) 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"
|Related terms:||business_activity operate|
|3.||[ noun ] 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"
|Related terms:||work process job go|
|4.||[ noun ] 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"
|Related terms:||activity undercover_operation rescue_operation|
|5.||[ noun ] (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"
|Related terms:||data_processing search asynchronous_operation auxiliary_operation access logic_operation concurrent_operation control_operation dyadic_operation fixed-cycle_operation multiplex_operation monadic_operation parallel_operation computer_operation printing_operation serial_operation boolean_operation sort synchronous_operation threshold_operation computer_science|
|6.||[ noun ] (military) a military or naval action (as a maneuver or campaign)|
"it was a joint operation of the navy and air force"
|Related terms:||military_action attack mission maneuver campaign support offense psychological_operation amphibious_operation covert_operation information_gathering naval_campaign Meuse combined_operation Operation_Desert_Storm peacekeeping military|
|7.||[ noun ] (work) 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"
|Related terms:||work go|
|8.||[ noun ] (medicine,surgery) a medical procedure involving an incision with instruments; performed to repair damage or arrest disease in a living body|
|Synonyms:||surgical_procedure surgery surgical_process surgical_operation|
"they will schedule the operation as soon as an operating room is available" "he died while undergoing surgery"
|Related terms:||therapy medical_procedure ablation palatopharyngoplasty vasovasostomy uranoplasty colostomy amputation implantation sex-change_operation arthroscopy sterilization face_lift hysterotomy plastic_surgery craniotomy cryosurgery curettage angioplasty debridement heart_surgery arthroplasty jejunostomy keratoplasty laparotomy autoplasty minor_surgery major_surgery neurosurgery myringectomy myringotomy sclerotomy Shirodkar's_operation strabotomy tracheostomy transplant trephination cautery dilation_and_curettage vivisection brain_surgery myringoplasty decortication electrosurgery enterostomy enucleation evisceration exenteration fenestration gastrectomy gastroenterostomy gastrostomy haemorrhoidectomy lobotomy nose_job iridectomy iridotomy intestinal_bypass microsurgery myotomy chemosurgery castration wrong-site_surgery orchiopexy osteotomy ostomy phalloplasty phlebectomy photocoagulation polypectomy resection rhinotomy rhizotomy taxis tympanoplasty suturing incision haemostasia hypophysectomize trepan decorticate suction freeze ablate surgery|
|9.||[ noun ] the activity of operating something (a machine or business etc.)|
"her smooth operation of the vehicle gave us a surprisingly comfortable ride"
|Related terms:||commercial_enterprise operate|
|10.||[ noun ] (psychology) the performance of some composite cognitive activity; an operation that affects mental contents|
|Synonyms:||process act cognitive_operation mental_process cognitive_process|
"the process of thinking" "the cognitive operation of remembering"
|Related terms:||cognition basic_cognitive_process higher_cognitive_process psychology|
|11.||[ noun ] (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"
|Related terms:||calculation construction integration differentiation relaxation_method matrix_operation combination arithmetic_operation permutation maximization exponentiation mathematics|