1. a small electronic device implanted in the chest to regulate heartbeat
Usage: medical
2. a person or animal that sets the pace in a race
Usage: sports
3. a person or thing that leads or sets the standard for others

Examples

• The doctor recommended a pacemaker to regulate her irregular heartbeat.
• His pacemaker has helped him live a normal, active life.
• The pacemaker led the runners through the first half of the marathon.
• She hired a pacemaker to help her achieve her personal best time.
• The company has been a pacemaker in developing renewable energy technology.
• As a pacemaker in fashion, she influences trends worldwide.
• The university serves as a pacemaker for educational innovation.