What does cornerstone mean?

n. a special stone at the bottom corner of a building, often placed in a ceremony; the most important part that everything else depends on

cornerstone

🇺🇸 /ˈkɔːrnərstəʊn/ 🇬🇧 /ˈkɔːnəstəʊn/

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noun

a special stone at the bottom corner of a building, often placed in a ceremony

The cornerstone was laid with great ceremony to mark the start of construction.

the most important part that everything else depends on

Trust is the cornerstone of any strong relationship.

a special stone at the bottom corner of a building, often placed in a ceremony; the most important part that everything else depends on

Plural cornerstones