Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
organiser is a noun meaning "someone who enlists workers to join a union". It carries 3 recorded senses.
someone who enlists workers to join a union
a person who brings order and organization to an enterprise
“she was the organizer of the meeting”
a lightweight consumer electronic device that looks like a hand-held computer but instead performs specific tasks; can serve as a diary or a personal database or a telephone or an alarm clock etc.
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 organiser come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.