In a curved stone archway, the keystone is the one at the very center of the top. The keystone is the most important stone, and that's why this word is also used figuratively to mean the most important part of anything.
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
Noun
the central building block at the top of an arch or vault
Noun
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"
n.
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.
Keystone
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
Usage Examples
I believe fundamental honesty is the keystone of business.
Owning a home is a keystone of wealth - both financial affluence and emotional security.
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Other Usage ExamplesI told the brethren that the Book of Mormon was the most correct of any book on earth, and the keystone of our religion, and a man would get nearer to God by abiding by its precepts, than by any other book.
Energy has become a national security issue and as technology continues to improve, there will be more debates like the one on Keystone.
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