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