keystone
/ˈkiːˌstoʊn/
noun
- The central stone at the top of an arch that holds the other stones in place.
- Without the keystone, the arch would collapse.
- The mason carefully set the keystone into the bridge.
- The ancient Romans carved the keystone with a decorative emblem.
- The most important part of a system, plan, or idea that supports everything else.
- Education is the keystone of a successful society.
- The new policy became the keystone of the company's growth strategy.
- Trust is the keystone of any strong relationship.
Synonyms