Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
ascertainable is an adjective meaning "capable of being ascertained or found out". It carries one recorded sense.
capable of being ascertained or found out
“ascertainable facts”
Definitions, synonyms and semantic relations for ascertainable come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.