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capstone (n.)

also cap-stone, topmost or finishing stone in a construction, 1680s, from cap + stone (n.). Earliest use is figurative.

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Definitions of capstone from WordNet

capstone (n.)
a final touch; a crowning achievement; a culmination;
Synonyms: finishing touch / copestone
capstone (n.)
a stone that forms the top of wall or building;
Synonyms: copestone / coping stone / stretcher
From wordnet.princeton.edu