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cornerstone

B2
Fairly common

Pronunciation

UK

  • /kˈɔːnəstˌəʊn/

US

  • /ˈkɔrnərˌstoʊn/

Meanings

Noun

  1. an essential basis or most important part of something

  2. a stone set at the corner or foundation of a building

Beyond the definition

Imagine building a grand cathedral. The cornerstone isn't just any stone; it's the first one set in place, carefully positioned because the rest of the building depends on it. In everyday use, a cornerstone is something you truly need—an idea, rule, or person that supports everything else. A strong family might have love as its cornerstone, while a business may rely on new ideas. Without the cornerstone, the structure crumbles.

Think of it like this: if you were building an argument, your main piece of evidence could be its cornerstone. Or maybe a beloved teacher was the cornerstone of your education, giving steady support and guidance. It's about what is most important—something you can't do without.

Examples

  1. 1

    Building ceremony

    Workers placed the cornerstone of the new courthouse in a public ceremony.

  2. 2

    Friendship

    Trust is the cornerstone of a strong friendship.

  3. 3

    Local economy

    Small businesses are a cornerstone of the local economy.

  4. 4

    Legal system

    The constitution remains one of the cornerstones of the country's legal system.

More examples
  1. 5

    Project foundation

    Good data is the cornerstone on which the whole project is built.

    • Patternthe cornerstone on which ... is built

      the main part that supports everything else

See also

Similar

Shades of meaning

Contrast

Used with (collocations)

  • cornerstone of democracy
  • cornerstone of policy
  • cornerstone of the argument
  • serve as a cornerstone

Explore

  • core principle
  • structural support

Forms and spellings

2 forms open this card.

Main spelling

  • cornerstonenoun

Forms

  • cornerstonespluralnoun