func·tion·al /ˈfʌŋ(k)ʃnəl, ʃənḷ/
  (a.)功能的,有作用的;函數的,泛函的
  func·tion·al /ˈfəŋ(k)ʃnəl, ʃənḷ/ 形容詞
  機能的,功能的,官能的
  functional
  功能的
  functional
  功能 函數
  Func·tion·al a.
  1. Pertaining to, or connected with, a function or duty; official.
  2. Pathology, Physiol. Pertaining to the function of an organ or part, or to the functions in general; involving or affecting function rather than physiology; as, functional deafness; a functional disease.  See functional disease, below. [wns=2]
  Functional disease Med., a disease of which the symptoms cannot be referred to any appreciable lesion or change of structure; the derangement of an organ arising from a cause, often unknown, external to itself opposed to organic disease, in which the organ itself is affected.
  ◄ ►
  functional
       adj 1: designed for or capable of a particular function or use; "a
              style of writing in which every word is functional";
              "functional architecture" [ant: nonfunctional]
       2: involving or affecting function rather than physiology;
          "functional deafness" [ant: organic]
       3: relating to or based on function especially as opposed to
          structure; "the problem now is not a constitutional one;
          it is a functional one"; "delegates elected on a
          functional rather than a geographical basis"
       4: fit or ready for use or service; "the toaster was still
          functional even after being dropped"; "the lawnmower is a
          bit rusty but still usable"; "an operational aircraft";
          "the dishwasher is now in working order" [syn: usable, useable,
           in working order(p), operable, operational]
       5: designed for or adapted to a function or use; "functional
          education selects knowledge that is concrete and usable
          rather than abstract and theoretical"; "functional
          architecture"
       6: (of e.g. a machine) performing or capable of performing; "in
          running (or working) order"; "a functional set of brakes"
          [syn: running(a), operative, working(a)]