The phrase "a cornerstone in a" is correct and usable in written English.
It can be used to describe something that is fundamental or essential to a particular concept, structure, or system.
Example: "Education is a cornerstone in a successful society, providing the foundation for informed citizens."
Alternatives: "a key element in a" or "a fundamental aspect of a".
The law "represents a cornerstone in a structure which is being built but is by no means complete," the President said.
Local officials, educators and artists see the $13 million state-funded school building project as a cornerstone in a downtown revitalization plan that focuses on reshaping the city to an arts destination at a time it is also struggling with a reputation as an area where illegal drug use and its associated social ills are prevalent.
Converting electric energy to chemical energy is therefore a cornerstone in a modern and sustainable energy economy.
"The day we took it over, we cut it to 12".; With so much reach, Paxson Communications is in a strong position to be a cornerstone in a new network.
This law represents a cornerstone in a structure which is being built but is by no means completed.
When President Franklin Roosevelt signed Social Security into law, he described it as "a cornerstone in a structure which is being built but is by no means completed".
"Life drawing has always been a cornerstone in an artist's training," said Linda Dente, who runs the artists fellowship program for the Connecticut Commission on the Arts.
Genetic testing is often heralded as a cornerstone in an imminent and exciting new age of personalized medicine, in which our health care is customized based on our individual genetic profiles.
Libya has never had a truly professional national army — a cornerstone in the building of a modern state — one that was not the personal tool of a king or dictator and purposely kept weak and divided to avert coups.
After years of an older aesthetic's deconstruction, the blouse, with feminine dressmaking details, appears to be a cornerstone in rebuilding fashion from a confused era of anything goes to a new direction of appropriateness and acceptability after 9/11.
The Copernicus is a cornerstone in the collection of a retired physician and amateur astronomer, Richard Green of Long Island, that constitutes pretty much a history of science and Western thought.
