What is a Cornerstone? Definition, Examples, and Significance

Cornerstone is a noun that refers to a stone or brick that forms the corner of a building, wall, or other structure. It is typically placed at the intersection of two walls or other structures and serves as a foundation for the rest of the construction.

In a metaphorical sense, cornerstone can also refer to something that serves as a foundation or a fundamental element of a larger structure or system. For example, a company's mission statement might be considered its cornerstone, as it provides the foundation for all of its other activities and decisions.

Examples of cornerstone in a sentence:

* The ancient castle's cornerstones were still visible despite centuries of weathering.
* The company's commitment to customer satisfaction has been a cornerstone of its success.
* The new building's cornerstones were laid with great fanfare and ceremony.