| opera | a medical procedure involving an incision with instruments |
|---|---|
| opera | (mathematics) calculation by mathematical methods |
| opera | activity by a military or naval force (as a maneuver or campaign) |
| opera | a business especially one run on a large scale |
| opera | the performance of some composite cognitive activity |
| opera | (computer science) data processing in which the result is completely specified by a rule (especially the processing that results from a single instruction) |
| opera | process or manner of functioning or operating |
| opera | the state of being in effect or being operative |
| opera | the portion of a set of operation descriptions that specifies the operation to be performed |
| opera | the United States and its allies defeated Iraq in a ground war that lasted 100 hours (1991) |
| opera | being in effect or operation |
| opera | (military) of or intended for or involved in military operations |