1. Relating to a function. 2. Not organic in origin; denoting a disorder with no known or detectable organic basis to explain the symptoms. See neurosis.
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b) affecting physiological or psychological functions but not organic structure <\functional heart disease> <a \functional psychosis> compare ORGANIC (1b)
2) performing or able to perform a regular function
func·tion·al·ly -ē adv
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func·tion·al (funkґshən-əl) 1. of or pertaining to a function. 2. affecting the function but not the structure; see under disorder.Medical dictionary. 2011.