Keystone vs. cornerstone: what’s the difference?
The short answer
Keystone originally refers to the central, wedge-shaped stone at the top of an arch, holding the other stones in place. Metaphorically, it suggests something that holds together or is the critical element of a structure or system. Cornerstone refers to the first stone set during the construction of a foundation, important for the stability and orientation of the entire building. Metaphorically, it suggests an initial and fundamental element upon which something is based or constructed.
What they have in common
Both keystone and cornerstone refer to something that is essential, foundational, or central to the success or integrity of a structure, concept, or system. They are both often used metaphorically to describe crucial elements in non-literal contexts.
Examples
keystone
- Education is the keystone of a healthy democracy.
- Trust serves as the keystone for all successful relationships.
cornerstone
- Honesty is the cornerstone of their business philosophy.
- The groundbreaking ceremony marked the laying of the new library’s cornerstone.
Which one is more common?
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