notional

having descriptive value as distinguished from syntactic category

• “sex is a notional category; gender is a syntactic one”

not based on fact; dubious

• “the falsehood about some fanciful secret treaties” F.D.Roosevelt
• “a small child”
• “;”
• “;”

not based on fact or investigation

• “a notional figure of cost helps in determining production costs”
• “speculative knowledge”

indulging in or influenced by fancy

• “a fanciful mind”
• “all the notional vagaries of childhood”

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”