| adjective | pertaining to a process or series of actions for achieving a result “operational difficulties” |
| adjective | fit or ready for use or service “the toaster was still functional even after being dropped” |
| adjective | (military) of or intended for or involved in military operations |
| adjective | being in effect or operation; - Leslie Marmon Silko “de facto apartheid is still operational even in the `new' African nations” |
| functionality | noun | capable of serving a purpose well |
| usableness | noun | the quality of being able to provide good service |
| use | verb | put into service; make work or employ for a particular purpose or for its inherent or natural purpose |
| useableness | noun | the quality of being able to provide good service |