1. a person or thing that has a significant effect or influence on something or someone
Usage: often used in business, sports, and social contexts
2. a tool or device that strikes or collides with something
Usage: technical or mechanical context

Examples

• She was a major impacter in the company's decision to go green.
• The new policy proved to be a significant impacter on employee morale.
• He is considered one of the top impacters in the tech industry.
• The impacter tool was used to drive the nails into the concrete.
• Social media influencers are often impacters of consumer behavior.
• The coach identified key impacters who could change the team's performance.