Etymology
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organiser (n.)

chiefly British English spelling of organizer (q.v.); for spelling, see -ize.

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Definitions of organiser

organiser (n.)
someone who enlists workers to join a union;
Synonyms: organizer / labor organizer
organiser (n.)
a person who brings order and organization to an enterprise;
Synonyms: organizer / arranger
organiser (n.)
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.;
Synonyms: personal digital assistant / pda / personal organizer / personal organiser / organizer
From wordnet.princeton.edu