Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
synchronously is an adverb meaning "in synchrony; in a synchronous manner". It carries one recorded sense.
in synchrony; in a synchronous manner
“in four-chambered hearts, the two auricles move synchronously”
Definitions, synonyms and semantic relations for synchronously come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.