Source : Webster's Revised Unabridged Dictionary (1913)

Notional \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.

Source : WordNet®

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}]