Keystone
Pronunciation: /ˈkiːˌstoʊn/
Keystone (noun)
- A central stone at the top of an arch that holds the structure together.
- An essential or most important part of a plan, system, or idea.
- A species that has a large effect on its environment and influences other species.
Examples
- The keystone holds the arch together.
- Without the keystone, the arch would collapse.
Common collocations: remove the keystone, place the keystone, keystone of strategy, serve as a keystone, keystone element