Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
fruitfully is an adverb meaning "in a productive way". It carries one recorded sense.
in a productive way
“they worked together productively for two years”
Definitions, synonyms and semantic relations for fruitfully come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.