Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
initialise is a verb meaning "assign an initial value to a computer program". It carries 2 recorded senses.
assign an initial value to a computer program
divide (a disk) into marked sectors so that it may store data
“Please format this disk before entering data!”
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 initialise come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.