1. The earliest ancestor; the founder of a family or line of descent.
Usage: formal; often used in genealogy and historical contexts
2. An original source or originator of something (such as an idea, movement, or tradition).
Usage: figurative

Examples

• The primogenitor of the royal family ruled over the kingdom centuries ago.
• Historians traced the family tree back to its primogenitor in medieval times.
• Darwin is considered the primogenitor of modern evolutionary theory.
• The primogenitor of jazz music emerged from the streets of New Orleans.
• She researched her primogenitor to understand her family's cultural heritage.
• The primogenitor of the company started with just a small workshop.