say it: NOH-shuh-nuhl
notional is an adjective meaning "not based on fact; existing only in the imagination". It carries 4 recorded senses.
not based on fact or investigation
“a notional figure of cost helps in determining production costs”
“speculative knowledge”
being of the nature of a notion or concept
“a plan abstract and conceptional”
“to improve notional comprehension”
“a notional response to the question”
Definitions, synonyms and semantic relations for notional come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.