notional in WordNet English dictionary

1. being of the nature of a notion or concept
   "a plan abstract and conceptional"; "to improve notional comprehension"; "a notional response to the question"
   conceptional  ideational  notional 
   
2. indulging in or influenced by fancy
   "a fanciful mind"; "all the notional vagaries of childhood"
   fanciful  notional 
   
3. 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"
   fanciful  imaginary  notional 
   
4. not based on fact or investigation
   "a notional figure of cost helps in determining production costs"; "speculative knowledge"
   notional  speculative