Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
part-owner is a noun meaning "a person who owns something in common with others". It carries one recorded sense.
a person who owns something in common with others
Definitions, synonyms and semantic relations for part-owner come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.