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