1of or having a special activity, purpose, or task:a functional role
relating to the way in which something works or operates:there are important functional differences between left and right brain
(of a disease) affecting the operation, rather than the structure, of an organ:functional diarrhoea
(of a mental illness) having no discernible organic cause:functional psychosis
2designed to be practical and useful, rather than attractive:a small, functional bathroom
3in operation; working:the museum will be fully functional from the opening of the festival
4 Mathematics relating to a variable quantity whose value depends upon one or more other variables:using functional notation, we can write—where L is the transactions demand for money
Derivatives
functionally
adverb
[sentence adverb]:functionally, the role of the library service is clearly educational
functional in other Oxford dictionaries
Definition of functional in the US English dictionary
