Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
preponderant is an adjective meaning "having superior power and influence". It carries one recorded sense.
having superior power and influence
“the predominant mood among policy-makers is optimism”
Definitions, synonyms and semantic relations for preponderant come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.