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1. Performing or able to perform its regular function
   "a functioning flashlight"

1. Process or manner of functioning or operating
   - operation, performance

1. Perform as expected when applied
   - work, operate, go, run
    
2. Serve a purpose, role, or function
   "The table functions as a desk"
   - serve
    
3. Perform duties attached to a particular office or place or function
   - officiate

See also: functional, functionary, operative, running, up, working

Type of: answer, do, physical process, process, serve, suffice

Antonym: malfunction, malfunctioning

Encyclopedia: Function