:of, connected with, or being a function
- the functional differences between the departments
:affecting physiological or psychological functions but not organic structure
:used to contribute to the development or maintenance of a larger whole
:designed or developed chiefly from the point of view of use
- functional and practical school courses
- The design of the building is not only functional but also beautiful.
:performing or able to perform a regular function
- The flashlight was still functional after I had dropped it.