1. people who begin or start something, especially a process, project, or action
Usage: plural of initiator
2. substances or devices that cause a chemical reaction or process to begin
Usage: chemistry; technical

Examples

• The initiators of the peace talks met privately before the conference.
• She was one of the main initiators of the recycling program at school.
• The project’s initiators worked tirelessly to secure funding.
• Chemical initiators are essential for starting polymerization reactions.
• The initiators of the protest organized a peaceful march downtown.
• Without proper initiators, the explosive device would not detonate.
• The initiators of the new policy faced significant opposition.