a medical procedure involving an incision with instruments; performed to repair damage or arrest disease in a living body | any surgical procedure involving the heart |
(mathematics) calculation by mathematical methods | |
activity by a military or naval force (as a maneuver or campaign) | |
a planned activity involving many people performing various actions | |
a process or series of acts especially of a practical or mechanical nature involved in a particular form of work | |
a business especially one run on a large scale | |
the activity of operating something (a machine or business etc.) | |
(psychology) the performance of some composite cognitive activity; an operation that affects mental contents | |
(computer science) data processing in which the result is completely specified by a rule (especially the processing that results from a single instruction) | |
process or manner of functioning or operating | |
the state of being in effect or being operative | |