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