1. a person who begins or starts something
2. a substance that starts a chemical reaction
Usage: chemistry

Examples

• She was the initiator of the school recycling program.
• The project needs a strong initiator to get it off the ground.
• As the initiator of the meeting, he prepared the agenda.
• The chemical initiator caused the reaction to begin immediately.
• Without an initiator, the polymerization process cannot start.
• He became known as the initiator of several successful business ventures.