1. trading operations
2. transaction, dealing, dealings, operation
3. business activity, commercial activity, operation
4. activity, operation
5. procedure, work, operation
6. action, activity, activeness, operation
7. surgery, surgical operation, surgical procedure, surgical process, medical procedure, operation
8. military operation, activity, operation
9. data processing, operation
10. functioning, performance, process, mathematical process
11. mathematical operation, operation, calculation, computation, computing, process
12. cognitive process, mental process, operation, cognitive operation, cognition, knowledge, noesis, operation
12. activity