The definition of functional is something that is useful for its intended purpose.
Producing a strong impression or response; striking:
(Surgery) Of or resulting from a surgical operation
That can be used; fit, convenient, or ready for use
Find another word for operational. In this page you can discover 20 synonyms, antonyms, idiomatic expressions, and related words for operational, like: in-operation, functional, effective, operative, be, usable, personnel, operating, useable, operable and nonoperational.