1. a person who begins or starts something; one who commences
Usage: formal or literary; often used in academic or ceremonial contexts

Examples

• As a commencer in the field of medicine, she was eager to learn from experienced physicians.
• The commencer of this project deserves recognition for the initial vision.
• Every commencer faces challenges when starting a new endeavor.
• He was a commencer of several successful business ventures.
• The commencer of the movement inspired thousands to join the cause.