| OP | the performance of some composite cognitive activity |
|---|---|
| OP | (computer science) data processing in which the result is completely specified by a rule (especially the processing that results from a single instruction) |
| OP | process or manner of functioning or operating |
| OP | the state of being in effect or being operative |
| OP | the portion of a set of operation descriptions that specifies the operation to be performed |
| OP | the United States and its allies defeated Iraq in a ground war that lasted 100 hours (1991) |
| OP | being in effect or operation |
| OP | (military) of or intended for or involved in military operations |
| OP | fit or ready for use or service |
| OP | pertaining to a process or series of actions for achieving a result |
| OP | loss of military equipment in field operations |
| OP | loss of military equipment in field operations |