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English definition of “functional”

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functional

adjective uk   /ˈfʌŋk.ʃən.əl/ us  

functional adjective (USEFUL)

B2 designed to be practical and useful rather than attractive: functional clothing

functional adjective (WORKING NORMALLY)

(of a machine, system, etc.) working in the usual way: Is the central heating functional yet? performing a particular operation: a functional disorder (= when an organ does not work as it should)
(Definition of functional from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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