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cornerstone

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The definition of a cornerstone is a stone at the corner of a building, or a basic, essential part of something.

(noun)

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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See cornerstone in Webster's New World College Dictionary

noun

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
the basic, essential, or most important part; foundation

Origin: ME

See cornerstone in American Heritage Dictionary 4

also corner stone

noun

a. A stone at the corner of a building uniting two intersecting walls; a quoin.
b. Such a stone, often inscribed, laid at a ceremony marking the origin of a building.
An indispensable and fundamental basis: the cornerstone of an argument.

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