"organiser" in the noun sense
1. organizer, organiser, labor organizer
someone who enlists workers to join a union
2. organizer, organiser, arranger
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
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.
Source: WordNet® (An amazing lexical database of English)
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