notional (adj.)youdaoicibaDictYouDict[notional 词源字典]
"pertaining to notions," 1590s, from notion + -al (earlier nocional, late 14c., from Medieval Latin notionalis). Meaning "full of whims" is from 1791. Grammatical sense is from 1928 (Jespersen); economics use is from 1958.[notional etymology, notional origin, 英语词源]