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