1. a person who atones; one who makes amends or reparation for a wrongdoing or offense
Usage: relatively uncommon; more often expressed as 'one who atones' or 'penitent'

Examples

• The atoner sought forgiveness from those he had harmed.
• As an atoner, she dedicated years to community service.
• He became an atoner after recognizing the impact of his past mistakes.
• The atoner's sincere efforts gradually restored trust with his family.