[adj] not based on fact or investigation; "a notional figure of cost helps in determining production costs"; "speculative knowledge"
[adj] being or of the nature of a notion or concept; "a plan abstract and conceptional"; "to improve notional comprehension"; "a notional response to the question"
[adj] indulging in or influenced by fancy; "a fanciful mind"; "all the notional vagaries of childhood"
[adj] 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"
[adj] (grammar) having descriptive value as distinguished from syntactic category; "sex is a notional category; gender is a syntactic one"