Cornerstone meaning

kôr'nər-stōn'
The definition of a cornerstone is a stone at the corner of a building, or a basic, essential part of something.

An example of a cornerstone is the first piece of stone placed for a new building, often inscribed with the date to commemorate the occasion.

An example of a cornerstone is the belief by Christians in Christ as the Son of God.

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An indispensable and fundamental basis.

The cornerstone of an argument.

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A stone that forms part of the corner of a building; esp., a foundation stone of this kind, often inscribed, laid at a ceremony that marks the beginning of building.
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The basic, essential, or most important part; foundation.
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A ceremonial stone set at the corner of a building, joining two exterior walls, and often inscribed with the starting and completion dates of construction, the name of the architect and owner, and other details.

The cornerstone on the Flatiron Building is set on the Fifth Avenue facade.

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By extension, that which is prominent, fundamental, noteworthy, or central.

Exceptional service is the cornerstone of the hospitality industry.

That is the cornerstone of any meaningful debate about budgets and projects, regulations and policies.

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