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