1) Active 2) Carrying out 3) Effective 4) Execution 5) Functional 6) Operation 7) Operational 8) Operative 9) Performance 10) Running 11) Working 1) Alive 2) In gear 3) On 4) Operational 5) Usable 
[adj] - performing or able to perform its regular function
functioning 1. Carrying out an activity. 2. Performing or able to perform a regular function.
performance noun process or manner of functioning or operating; `the power of its engine determine its operation`; `the plane`s operation in high winds`; `they compared the cooking performance of each oven`; `the jet`s performance conformed to high s... adjective performing or able to perform its regular function; `a functioning flashlight`