WordNet (r) 3.0 (2006):

organiser
    n 1: someone who enlists workers to join a union [syn:
         organizer, organiser, labor organizer]
    2: a person who brings order and organization to an enterprise;
       "she was the organizer of the meeting" [syn: organizer,
       organiser, arranger]
    3: 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. [syn: personal digital assistant, PDA,
       personal organizer, personal organiser, organizer,
       organiser]