People who arrange, coordinate, or systematically plan events, activities, or groups. Can also refer to storage containers or tools that help arrange items.
From French organiser, from Medieval Latin organizare, from Greek organon meaning 'tool, instrument.' The word evolved from biological organization to human coordination activities in the 18th century.
The connection between biological 'organs' and event 'organizers' reveals how we understand complex systems - both require different parts working together harmoniously. Professional organizers as a career didn't exist until the 1980s, showing how modern life created new needs for systematic arrangement.
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