Operation Definition

Define what is Operation?

1. operation (noun)

the state of being in effect or being operative.

  • that rule is no longer in operation.

activeness, action, activity noun
the state of being active.


commission noun
the state of being in good working order and ready for operation.

running noun
the state of being in operation.

idle noun
the state of an engine or other mechanism that is idling.

2. operation (noun)

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.

business activity, commercial activity noun
activity undertaken as part of a commercial enterprise.

3. operation (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.

activity noun
any specific behavior.


rescue operation noun
an operation organized to free from danger or confinement.

undercover operation noun
an operation involving secret work within a community or institution.

4. operation (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.

data processing noun
(computer science) a series of operations on data by a computer in order to retrieve or transform or classify information.


memory access, access noun
(computer science) the operation of reading or writing stored information.

asynchronous operation noun
operations that occur without a regular or predictable time relation to other events.

auxiliary operation, off-line operation noun
a operation performed by off-line equipment not under the control of the central processing unit.

binary arithmetic operation, binary operation, boolean operation noun
an operation that follows the rules of Boolean algebra; each operand and the result take one of two values.

computer operation, machine operation noun
an elementary operation that a computer is designed and built to perform.

concurrent operation noun
two or more operations performed at the same time (or within a give interval).

control function, control operation noun
an operation that controls the recording or processing or transmission of interpretation of data.

dyadic operation noun
an operation on exactly two operands.

fixed-cycle operation noun
an operation that is completed in a specified number of regularly timed execution cycles.

logic operation, logical operation noun
an operation that follows the rules of symbolic logic.

monadic operation, unary operation noun
an operation with exactly one operand.

multiplex operation noun
an operation in which two or more activities are interleaved.

parallel operation, simultaneous operation noun
the simultaneous execution of two or more operations.

printing operation noun
an operation that controls the printing or display of information.

lookup, search noun
an operation that determines whether one or more of a set of items has a specified property.

consecutive operation, sequential operation, serial operation noun
the sequential execution of operations one after another.

sorting, sort noun
an operation that segregates items into groups according to a specified criterion.

synchronous operation noun
operations that are initiated predictably by a clock.

threshold operation noun
an operation performed on operands in order to obtain the value of a threshold function.

5. military operation, operation (noun)

activity by a military or naval force (as a maneuver or campaign).

  • it was a joint operation of the navy and air force.

activity noun
any specific behavior.


combined operation noun
a military operation carried out cooperatively by two or more allied nations or a military operation carried out by coordination of sea, land, and air forces.

maneuver, simulated military operation, manoeuvre noun
a military training exercise.

military campaign, campaign noun
several related operations aimed at achieving a particular goal (usually within geographical and temporal constraints).

naval campaign noun
an operation conducted primarily by naval forces in order to gain or extend or maintain control of the sea.

military mission, mission noun
an operation that is assigned by a higher headquarters.

reinforcement, reenforcement, support noun
a military operation (often involving new supplies of men and materiel) to strengthen a military force or aid in the performance of its mission.

attack, onrush, onset, onslaught noun
(military) an offensive against an enemy (using weapons).

offence, offensive, offense noun
the action of attacking an enemy.

peacekeeping, peacekeeping mission, peacekeeping operation noun
the activity of keeping the peace by military forces (especially when international military forces enforce a truce between hostile groups or nations).

amphibious operation noun
a military operation by both land and sea forces.

information gathering noun
the act of collecting information.

psychological operation, psyop noun
military actions designed to influence the perceptions and attitudes of individuals, groups, and foreign governments.

covert operation noun
an intelligence operation so planned as to permit plausible denial by the sponsor.

6. surgical operation, surgical procedure, surgical process, surgery, operation (noun)

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.

medical procedure noun
a procedure employed by medical or dental practitioners.


catheterisation, catheterization noun
the operation of introducing a catheter into the body.

ablation, cutting out, extirpation, excision noun
surgical removal of a body part or tissue.

amputation noun
a surgical removal of all or part of a limb.

angioplasty noun
an operation to repair a damaged blood vessel or unblock a coronary artery.

arthroplasty noun
surgical reconstruction or replacement of a malformed or degenerated joint.

arthroscopy noun
a minimally invasive operation to repair a damaged joint; the surgeon examines the joint with an arthroscope while making repairs through a small incision.

brain surgery noun
any surgical procedure involving the brain.

castration noun
surgical removal of the testes or ovaries (usually to inhibit hormone secretion in cases of breast cancer in women or prostate cancer in men).

cauterisation, cauterization, cautery noun
the act of coagulating blood and destroying tissue with a hot iron or caustic agent or by freezing.

chemosurgery noun
use of chemical to destroy diseased or malignant tissue; used in treatment of skin cancer.

craniotomy noun
a surgical opening through the skull.

cryosurgery noun
the use of extreme cold (usually liquid nitrogen) to destroy unwanted tissue (warts or cataracts or skin cancers).

curettage, curettement noun
surgery to remove tissue or growths from a bodily cavity (as the uterus) by scraping with a curette.

debridement noun
surgical removal of foreign material and dead tissue from a wound in order to prevent infection and promote healing.

decortication noun
removal of the outer covering of an organ or part.

D and C, dilatation and curettage, dilation and curettage noun
a surgical procedure usually performed under local anesthesia in which the cervix is dilated and the endometrial lining of the uterus is scraped with a curet; performed to obtain tissue samples or to stop prolonged bleeding or to remove small tumors or to remove fragments of placenta after childbirth or as a method of abortion.

electrosurgery noun
surgery performed with electrical devices (as in electrocautery).

enterostomy, enterotomy noun
surgical operation that creates a permanent opening through the abdominal wall into the intestine.

enucleation noun
surgical removal of something without cutting into it.

wrong-site surgery noun
a surgical operation performed on the wrong part of the body.

evisceration noun
surgical removal of an organ (or the contents of an organ) from a patient.

exenteration noun
surgical removal of the organs within a body cavity (as those of the pelvis).

eye operation, eye surgery noun
any surgical procedure involving the eyes.

fenestration noun
surgical procedure that creates a new fenestra to the cochlea in order to restore hearing lost because of osteosclerosis.

gastrectomy noun
surgical removal of all or part of the stomach.

gastroenterostomy noun
surgical creation of an opening between the stomach wall and the small intestines; performed when the normal opening has been eliminated.

gastrostomy noun
surgical creation of an opening through the abdominal wall into the stomach (as for gastrogavage).

heart surgery noun
any surgical procedure involving the heart.

haemorrhoidectomy, hemorrhoidectomy noun
surgical procedure for tying hemorrhoids and excising them.

hysterotomy noun
surgical incision into the uterus (as in cesarean section).

implantation noun
a surgical procedure that places something in the human body.

intestinal bypass noun
surgical operation that shortens the small intestine; used in treating obesity.

jejunostomy noun
surgical creation of an opening between the jejunum and the anterior abdominal wall; will allow artificial feeding.

major surgery noun
any surgical procedure that involves anesthesia or respiratory assistance.

microsurgery noun
surgery using operating microscopes and miniaturized precision instruments to perform intricate procedures on very small structures.

minor surgery noun
any surgical procedure that does not involve anesthesia or respiratory assistance.

myotomy noun
surgical incision or division of a muscle.

myringectomy noun
surgical removal of the eardrum.

myringoplasty noun
surgical repair of a perforated eardrum with a tissue graft.

myringotomy noun
surgical incision into the eardrum (to relieve pressure or release pus from the middle ear).

neurosurgery noun
any surgery that involves the nervous system (brain or spinal cord or peripheral nerves).

orchiopexy noun
operation to bring an undescended testicle into the scrotum.

osteotomy noun
surgical sectioning of bone.

ostomy noun
surgical procedure that creates an artificial opening for the elimination of bodily wastes.

palatopharyngoplasty, PPP, UPPP, uvulopalatopharyngoplasty noun
surgical resection of unnecessary palatal and oropharyngeal tissue to open the airway; intended to cure extreme cases of snoring (with or without sleep apnea).

phlebectomy noun
surgical removal or all or part of a vein; sometimes done in cases of severe varicose veins.

photocoagulation noun
surgical procedure that uses an intense laser beam to destroy diseased retinal tissue or to make a scar that will hold the retina in cases of detached retina.

anaplasty, plastic surgery, reconstructive surgery noun
surgery concerned with therapeutic or cosmetic reformation of tissue.

polypectomy noun
surgical removal of a polyp.

resection noun
surgical removal of part of a structure or organ.

rhinotomy noun
surgical procedure in which an incision is made in the nose to drain accumulated pus.

rhizotomy noun
surgical procedure in which spinal nerve roots are cut; done (anterior roots) to relieve intractable pain or (posterior roots) to stop severe muscle spasms.

sex-change operation, transsexual surgery noun
surgical procedures and hormonal treatments designed to alter a person's sexual characteristics so that the resemble those of the opposite sex.

purse-string operation, Shirodkar's operation noun
a surgical procedure in which a suture is used to close the cervix in a pregnant woman; is performed when the cervix has failed to retain previous pregnancies.

sterilisation, sterilization noun
the act of making an organism barren or infertile (unable to reproduce).

strabotomy noun
the surgical operation of cutting a muscle or tendon of the eye in order to correct strabismus.

taxis noun
the surgical procedure of manually restoring a displaced body part.

tracheostomy, tracheotomy noun
a surgical operation that creates an opening into the trachea with a tube inserted to provide a passage for air; performed when the pharynx is obstructed by edema or cancer or other causes.

organ transplant, transplantation, transplant noun
an operation moving an organ from one organism (the donor) to another (the recipient).

trephination noun
an operation that removes a circular section of bone from the skull.

tympanoplasty noun
surgical correction or repair of defects or injuries in the eardrum or the bones of the middle ear.

uranoplasty noun
surgical correction of a defect of the palate.

vasovasostomy noun
a surgical procedure that attempts to restore the function of the vas deferens after a vasectomy.

vivisection noun
the act of operating on living animals (especially in scientific research).

7. procedure, operation (noun)

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.
Synonyms: procedure

work noun
activity directed toward making or doing something.

8. functioning, performance, operation (noun)

process or manner of functioning or operating.

  • the power of its engine determines 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.

physical process, process noun
a sustained phenomenon or one marked by gradual changes through a series of states.

9. cognitive operation, cognitive process, mental process, process, operation (noun)

(psychology) the performance of some composite cognitive activity; an operation that affects mental contents.

  • the process of thinking.
  • the cognitive operation of remembering.

cognition, knowledge, noesis noun
the psychological result of perception and learning and reasoning.


basic cognitive process noun
cognitive processes involved in obtaining and storing knowledge.

higher cognitive process noun
cognitive processes that presuppose the availability of knowledge and put it to use.

10. mathematical operation, mathematical process, operation (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.

calculation, computation, computing noun
the procedure of calculating; determining something by mathematical or logical methods.


permutation noun
the act of changing the arrangement of a given number of elements.

combination noun
the act of arranging elements into specified groups without regard to order.

differentiation noun
the mathematical process of obtaining the derivative of a function.

maximization noun
the mathematical process of finding the maximum value of a function.

integration noun
an operation used in the calculus whereby the integral of a function is determined.

exponentiation, involution noun
the process of raising a quantity to some assigned power.

arithmetic operation noun
a mathematical operation involving numbers.

matrix operation noun
a mathematical operation involving matrices.

construction noun
drawing a figure satisfying certain conditions as part of solving a problem or proving a theorem.

relaxation method, relaxation noun
a method of solving simultaneous equations by guessing a solution and then reducing the errors that result by successive approximations until all the errors are less than some specified amount.

11. operation (noun)

the activity of operating something (a machine or business etc.).

  • her smooth operation of the vehicle gave us a surprisingly comfortable ride.

activity noun
any specific behavior.

Nearby Terms

operation code (noun)
the portion of a set of operation descriptions that specifies the operation to be performed; the set of operations in a computer

Operation Desert Storm (noun)
the United States and its allies defeated Iraq in a ground war that lasted 100 hours (1991)

operational (adjective)
pertaining to a process or series of actions for achieving a result

operational casualty (noun)
loss of military equipment in field operations

operational cell (noun)
a terrorist cell that performs clandestine activities

operational damage (noun)
loss of military equipment in field operations

operationalism (noun)
(philosophy) the doctrine that the meaning of a proposition consists of the operations involved in proving or applying it

operationalist (adjective)
of or relating to or espousing operationalism

operationally (adverb)
in respect to operation

operations (noun)
financial transactions at a brokerage; having to do with the execution of trades and keeping customer records

operations research (noun)
research designed to determine most efficient way to do something

operative (noun)
a person secretly employed in espionage for a government

operative field (noun)
the area that is open during surgery

operatively (adverb)
in a manner to produce an effect

operator (noun)
(mathematics) a symbol or function representing a mathematical operation