Cornerstone
Part of speech: noun
Definition: A ceremonial stone set at the corner of a building, joining two exterior walls, and often inscribed with the starting and completion dates of construction, the name of the architect and owner, and other details. By extension, that which is prominent, fundamental, noteworthy, or central.
Example sentence: The rule of law and the independence of the judiciary underpin our democracy and lie at the heart of our way of life. They are the very cornerstone of our freedoms.
Groundwork
Part of speech: noun
Definition: The foundation; the basic or fundamental parts that support or allow for the rest.
Example sentence: A National Database on Autism Research is fostering sharing of data and collaborations. Scientists are also making great strides at the interface of biology and engineering with new technologies that are laying the groundwork for future advances.