Keystone vs. Cornerstone

Keystonenoun

(architecture) The top stone of an arch.

Keystonenoun

Something on which other things depend for support.

Keystonenoun

A native or resident of the American state of Pennsylvania.

Keystonenoun

(retail) A retail price that is double the cost price; a markup of 100%.

Keystoneverb

(transitive) To distort (an image) by projecting it onto a surface at an angle, which for example causes a square to look like a trapezoid.

Keystoneverb

To double the cost price in order to determine the retail price; to apply a markup of 100%.

Keystonenoun

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.

Keystonenoun

a central cohesive source of support and stability;

Keystonenoun

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

Cornerstonenoun

A stone forming the base at the corner of a building.

Cornerstonenoun

Such a stone used ceremonially, often inscribed with the architect's and owner's names, dates and other details.

Cornerstonenoun

(figuratively) That which is prominent, fundamental, noteworthy, or central.

Cornerstonenoun

the fundamental assumptions from which something is begun or developed or calculated or explained;

Cornerstonenoun

a stone in the exterior of a large and important building; usually carved with a date and laid with appropriate ceremonies

Cornerstonenoun

a stone at the outer corner of two intersecting masonry walls

Cornerstonenoun

an important quality or feature on which a particular thing depends or is based

Cornerstonenoun

a stone that forms the base of a corner of a building, joining two walls.

Cornerstone

The cornerstone (or foundation stone or setting stone) is the first stone set in the construction of a masonry foundation. All other stones will be set in reference to this stone, thus determining the position of the entire structure.