Keystone in a sentence as a noun

And a keystone of this madness is the War on *****.

That's not to say both aren't growing, but that neither is the keystone of Apple's future growth and success.

Do your results conflict with some keystone experiment performed 10 years ago by famous people?

A lot of the discussion here is focused on teachers because we think that they are the keystone to a quality education.

The use of railways for transporting petroleum products is booming thanks to the backlash against pipelines such as keystone and gateway.

They are the American people's liberty teeth and keystone under independence .

Intellectual property protection is the keystone of a modern knowledge economy.

Keystone definitions

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"

See also: anchor mainstay backbone linchpin lynchpin

noun

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

See also: headstone