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

1. How well something operates
   "the power of its engine determines its functioning";
   - operation, performance

1. Perform as intended or designed
   "This old radio doesn't function anymore";
   - work, operate, go, run
    
2. Act to fulfil a purpose, role, or function
   "The table functions as a desk";
   - serve
    
3. Perform duties attached to a particular office, place or function
   "His wife functioned as his private secretary";
   - officiate

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

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

Antonym: malfunction, malfunctioning

Encyclopedia: Function