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English to English noun
| 1 |
a central cohesive source of support and stability |  | Example: faith is his anchor
the keystone of campaign reform was the ban on soft money
he is the linchpin of this firm
source: wordnet30
| 2 |
the central building block at the top of an arch or vault | | source: wordnet30
| 3 |
The central or topmost stone of an arch. This in some styles is made different in size from the other voussoirs, or projects, or is decorated with carving. See Illust. of Arch. | | source: webster1913
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