capstone
US /ˈkæp.stoʊn/
UK /ˈkæp.stoʊn/
1.
a final and crowning achievement, a culminating point
:
•
The successful launch of the satellite was the capstone of his career.
•
Her doctoral thesis was the capstone of years of research.
2.
a finishing stone of a structure
:
•
The mason carefully placed the capstone on the wall.
•
The pyramid was completed with a golden capstone.