Capstone definition

kăpstōn
The top stone of a structure or wall.
noun
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The highest point, as of achievement.
noun
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The uppermost stone of a structure.
noun
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The definition of a capstone is a concluding or crowning achievement, a finishing touch or a large flat stone placed on top of a wall or building.

Landing a major account the day before you retire is an example of a capstone in your career.

The flat finished row of stones placed atop a retaining wall built in your back yard that gives the wall a clean, smooth top is an example of a capstone.

noun
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Any of the stones in a coping.
noun
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Any of the stones making up the top layer of a wall; a coping stone.
noun
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A crowning achievement, culmination or finishing touch.
noun
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The crowning achievement or final stroke; the culmination or acme.
noun
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Other Word Forms

Noun

Singular:
capstone
Plural:
capstones