Word: cornerstone
A stone forming the base at the corner of a building.
Such a stone used ceremonially, often inscribed with the architect's and owner's names, dates and other details. Example: The cornerstone on the Flatiron Building is set on the Fifth Avenue facade.
That which is prominent, fundamental, noteworthy, or central. Example: Exceptional service is the cornerstone of the hospitality industry.
You can find a list of possible crossword clues for CORNERSTONE below.