A stone placed on top of a structure, generally as a finishing piece.

A major achievement or culmination of efforts.

प्रयासों की एक प्रमुख उपलब्धि या चरम सीमा।

English Usage: Completing the marathon was the capstone of her training.

Hindi Usage: मैराथन को पूरा करना उसकी प्रशिक्षण की कैपस्टोन थी।