Webster's English Dictionary

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functional

func.tion.al \'f*n(k)-shn*l, -sh*n-*l\ \-e-\ aj 1a: of, connected with, or 
   being a function  1b: affecting functions but not structure  2: used to 
   contribute to the development or maintenance of a larger whole;  also : 
   designed or developed chiefly from the point of view of use 3: performing 
   or able to perform its regular function  4: placing related functions (as 
   in an industry) under the direction of a  specialist - func.tion.al.ly av