## As nouns the difference between **vitality** and **functional**

is that

**vitality** is the capacity to live and develop while

**functional** is (mathematics) a function that takes a function as its argument; more precisely: a function

*y''=''f''(''x'') whose argument ''x * varies in a space of (real valued, complex valued) functions and whose value belongs to a monodimensional space an example: the definite integration of integrable real functions in a real interval.

## As an adjective **functional** is

in good working order.