Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
spontaneousness is a noun meaning "the quality of being spontaneous and coming from natural feelings without constraint". It carries one recorded sense.
the quality of being spontaneous and coming from natural feelings without constraint
“the spontaneity of his laughter”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for spontaneousness come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.