1. a person who arranges or coordinates activities, events, or groups
2. a container or system used to arrange and store items in an orderly way
3. a book, app, or device used to keep track of appointments, tasks, and schedules

Examples

• The event organizer made sure everything ran smoothly.
• She’s the main organizer of the school fundraiser.
• I bought a desk organizer to keep my supplies neat.
• The closet organizer has compartments for shoes and clothes.
• My digital organizer reminds me of important meetings.
• He writes all his appointments in a paper organizer.
• The community organizer helped residents voice their concerns.