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cornerstone
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
See cornerstone in American Heritage Dictionary 4
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