Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
ideational is an adjective meaning "being of the nature of a notion or concept". It carries one recorded sense.
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 ideational come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.