[syn: conceptional, ideational, notional]
The Collaborative International Dictionary of English v.0.48:
Notional \No"tion*al\, a.
   1. Consisting of, or conveying, notions or ideas; expressing
      abstract conceptions.
      [1913 Webster]
   2. Existing in idea only; visionary; whimsical.
      [1913 Webster]
            Discourses of speculative and notional things.
                                                  --Evelyn.
      [1913 Webster]
   3. Given to foolish or visionary expectations; whimsical;
      fanciful; as, a notional man.
      [1913 Webster]
WordNet (r) 3.0 (2006):
notional
    adj 1: not based on fact; unreal; "the falsehood about some
           fanciful secret treaties"- F.D.Roosevelt; "a small
           child's imaginary friends"; "to create a notional world
           for oneself" [syn: fanciful, imaginary, notional]
    2: not based on fact or investigation; "a notional figure of
       cost helps in determining production costs"; "speculative
       knowledge" [syn: notional, speculative]
    3: indulging in or influenced by fancy; "a fanciful mind"; "all
       the notional vagaries of childhood" [syn: fanciful,
       notional]
    4: 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, notional]
Moby Thesaurus II by Grady Ward, 1.0:
87 Moby Thesaurus words for "notional":
   Gothic, abstract, academic, arbitrary, armchair, baroque, bizarre,
   brain-born, capricious, conceptive, conceptual, conjectural,
   cranky, creative, crotchety, dream-built, esemplastic, extravagant,
   fancied, fanciful, fancy-born, fancy-built, fancy-woven, fantasied,
   fantasque, fantastic, fecund, fertile, fictive, flaky, florid,
   freakish, germinal, grotesque, harebrained, humorsome, hypothetic,
   ideal, ideational, ideative, ideological, illusory, imaginary,
   imaginational, imaginative, imagined, impractical, ingenious,
   inspired, inventive, kinky, maggoty, moody, moot, motiveless,
   nonexistent, original, originative, outlandish, petulant,
   postulatory, pregnant, preposterous, productive, prolific, quirky,
   rococo, seminal, shadowy, shaping, speculative, supposititious,
   teeming, temperamental, theoretical, unactual, unreal,
   unreasonable, unrestrained, vagarious, vagrant, visional, visioned,
   wanton, wayward, whimsical, wild