Definitions for



Overview of noun keystone

The noun keystone has 2 senses? (no senses from tagged texts)
1. anchor, mainstay, keystone, backbone, linchpin, lynchpin

(a central cohesive source of support and stability; "faith is his anchor"; "the keystone of campaign reform was the ban on soft money"; "he is the linchpin of this firm")

2. keystone, key, headstone

(the central building block at the top of an arch or vault)

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