形容詞 notional:

1. not based on fact; dubious
   同義詞：fanciful, imaginary, imagined
2. not based on fact or investigation
   同義詞：speculative
3. indulging in or influenced by fancy
   同義詞：fanciful
4. being of the nature of a notion or concept
   同義詞：conceptional, ideational

1. My calculation is based on notional figures, since the actual figures are not yet available.
   因尚無(wú)實(shí)際數(shù)字，我是根據(jù)估計(jì)的數(shù)字計(jì)算的。

no.tion.al

adj.（形容詞）
Of, containing, or being a notion; mental or imaginary.
概念的，包含概念的或是概念的；想象的或虛構(gòu)的
Speculative or theoretical.
抽象或理論的
Linguistics Conveying an idea of a thing or an action; having full lexical meaning as distinguished from relational meaning. The worddid is notional in We did the work and relational in We did not agree.
【語(yǔ)言學(xué)】 表意的，實(shí)義的：表達(dá)事物或行動(dòng)的想法；有完全的詞義而不同于關(guān)系含義的did 在 We did the work 中是表意的，在 We did not agree 中是表關(guān)系的

【引伸】
no.tionally
adv.（副詞）