1. people who include others in activities or situations
2. people who participate actively in something

Examples

• The project leaders were natural involvers who made sure everyone had a role.
• As involvers in the community program, they encouraged broad participation.
• The teachers acted as involvers, drawing shy students into class discussions.
• Good managers are involvers who engage their entire team.
• The involvers in the charity drive recruited dozens of volunteers.
• She was one of the main involvers in organizing the school festival.