What is a cornerstone?
■ An important quality or feature on which a particular building depends or is based.
■ Foundation
■ Basis
■ Keystone
■ Mainspring
… of that building
The cornerstone of something is the basic part of it on which its existence, success, or truth depends.
A stone in a corner of a building, especially one with the date when the building was made or other important writing on it.
Comments