English dictionary

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English noun: keystone

1. keystone (cognition) a central cohesive source of support and stability

SamplesFaith is his anchor.
The keystone of campaign reform was the ban on soft money.
He is the linchpin of this firm.

Synonymsanchor, backbone, linchpin, lynchpin, mainstay

Broader (hypernym)support

2. keystone (artifact) the central building block at the top of an arch or vault

Synonymsheadstone, key

Broader (hypernym)building block

Narrower (hyponym)coign, coigne, quoin

Part meronymarch

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