Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
synchronise is a verb meaning "happen at the same time". It carries 6 recorded senses.
happen at the same time
make (motion picture sound) exactly simultaneous with the action
“synchronize this film”
movie
make synchronous and adjust in time or manner
“Let's synchronize our efforts”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for synchronise come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.