capstone

/ˈkæpˌstoʊn/
noun
  1. A stone that forms the top of a wall, arch, or building; a finishing touch.
    • The ancient temple's capstone had carvings of the sun and moon.
    • Workers carefully placed the capstone on the arch to complete the structure.
    • The capstone at the top of the pyramid was made of polished granite.
  2. A final, crowning achievement or project that brings together everything a person has learned or done.
    • Winning the championship was the capstone of his athletic career.
    • The company's new product line served as a capstone to years of research.
    • Her senior thesis was the capstone of her college education.
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