The phrase "as cornerstone" is correct and usable in written English.
It can be used to indicate that something is fundamental or essential to a particular concept, structure, or system.
Example: "Education serves as cornerstone of a successful society, shaping the future of its citizens."
Alternatives: "as a foundation" or "as a key element".
Agricultural Bank of China is thought to have lined up state-owned funds from Kuwait, Qatar and Singapore as cornerstone investors in its imminent listing.
But because of the size of the US and its deep capital markets – and its crucial role as cornerstone of global finance – it remains to be seen exactly what impact the move will have when financial markets reopen on Monday.
Still seen as cornerstone of PSB and "fully funded" by licence fee income (a phase one plan to "top-slice" part of this revenue and hand a portion to other channels was dropped).
In the other bids, one fronted by AnaCap and the Blackstone Group and the other by Corsair Capital and Centerbridge Partners, the buyers would provide 600 million to 800 million pounds as cornerstone investors in a future listing.
Los Alamos Laboratory was created in World War II as cornerstone of the Manhattan Project to develop the first atomic bomb, and it has continued to operate over the decades since as a storied and mystery-shrouded center of military science.
Within Europe, ESA has selected the comet nucleus rendezvous mission ROSETTA, including a small lander, as Cornerstone 3 of its scientific program Horizon 2000.
Marbury and Curry were once viewed as cornerstones of the organization.
They are encouraged in their roles as cornerstones of family and community life.
As if the hubris and ego of my life were as cornerstones of a dungeon to myself.
He speaks constantly about the environment and technology initiatives, which he presents as cornerstones of his leadership approach.
All decent players who've seen time in the US national team, Kinnear used them as cornerstones of MLS champions.
