WordWeb Online

1. Pertaining to a process or series of actions for achieving a result
   "operational difficulties"; "they assumed their operational positions"
    
2. (military) of or intended for or involved in military operations
    
3. Fit or ready for use or service
   "an operational aircraft";
   - functional, usable, useable, operable
    
4. Being in effect or operation
   "de facto apartheid is still operational even in the 'new' African nations";
   - in operation, operating

See also: active, combat-ready, effective, fighting, operative, serviceable

Antonym: inactive

Encyclopedia: Operational