the state of being in effect or being operative

a business especially one run on a large scale

a planned activity involving many people performing various actions

(computer science) data processing in which the result is completely specified by a rule (especially the processing that results from a single instruction)

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

a medical procedure involving an incision with instruments; performed to repair damage or arrest disease in a living body

a process or series of acts especially of a practical or mechanical nature involved in a particular form of work

process or manner of functioning or operating

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

(mathematics) calculation by mathematical methods

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

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

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

pertaining to a process or series of actions for achieving a result

fit or ready for use or service

(military) of or intended for or involved in military operations

being in effect or operation

loss of military equipment in field operations

a terrorist cell that performs clandestine activities

loss of military equipment in field operations

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

of or relating to or espousing operationalism

in respect to operation

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

research designed to determine most efficient way to do something