no·tion·al /ˈnoʃnəl, ʃənḷ/
  (a.)概念的,想象的
  No·tion·al a.
  1. Consisting of, or conveying, notions or ideas; expressing abstract conceptions.
  2. Existing in idea only; visionary; whimsical.
     Discourses of speculative and notional things.   --Evelyn.
  3. Given to foolish or visionary expectations; whimsical; fanciful; as, a notional man.
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  notional
       adj 1: having descriptive value as distinguished from syntactic
              category; "sex is a notional category; gender is a
              syntactic one"
       2: not based on fact; dubious; "the falsehood about some
          fanciful secret treaties"- F.D.Roosevelt; "a small child's
          imaginary friends"; "her imagined fame"; "to create a
          notional world for oneself" [syn: fanciful, imaginary,
           imagined]
       3: not based on fact or investigation; "a notional figure of
          cost helps in determining production costs"; "speculative
          knowledge" [syn: speculative]
       4: indulging in or influenced by fancy; "a fanciful mind"; "all
          the notional vagaries of childhood" [syn: fanciful]
       5: being (or being of the nature of) a notion or concept; "a
          plan abstract and conceptional"; "to improve notional
          comprehension"; "a notional response to the question"
          [syn: conceptional, ideational]