1. a stone that forms the top of a wall or other structure
Usage: architecture
2. the crowning achievement or final touch that completes something
3. a final project or course that demonstrates mastery of a subject
Usage: education

Examples

• The mason carefully placed the capstone on top of the garden wall.
• Winning the championship was the capstone of her athletic career.
• The capstone course required students to present their research findings.
• His autobiography served as the capstone to a distinguished writing career.
• The ancient pyramid’s capstone had been missing for centuries.
• The capstone project took her entire senior year to complete.
• This merger represents the capstone of our expansion strategy.