Definition of functional
1a : of, connected with, or being a function the functional differences between the departments
b : affecting physiological or psychological functions but not organic structure functional heart disease
2 : used to contribute to the development or maintenance of a larger whole functional and practical school courses also : designed or developed chiefly from the point of view of use The design of the building is not only functional but also beautiful.
3 : performing or able to perform a regular function The flashlight was still functional after I had dropped it.
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