Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
vocalisation is a noun meaning "the sound made by the vibration of vocal folds modified by the resonance of the vocal tract". It carries one recorded sense.
the sound made by the vibration of vocal folds modified by the resonance of the vocal tract
“a singer takes good care of his voice”
“the giraffe cannot make any vocalizations”
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 vocalisation come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.