The phrase "also the cornerstone of" is correct and usable in written English.
It can be used to indicate that something is fundamental or essential to a particular concept, idea, or structure.
Example: "Education is also the cornerstone of a successful society, providing the foundation for informed citizens."
Alternatives: "also the foundation of" or "also the basis of".
It is also the cornerstone of modern international law.
The restoration is also the cornerstone of a campuswide arts master plan that will add to or refurbish almost all the university's art and architecture buildings.
It is also the cornerstone of practical interventions (psychological treatments) designed to change behavior, thus reinforcement has many applications in clinical, educational, and organizational contexts.
This uncertainty principle is not only the engine that generates comedy and suspense in the brothers' films; it's also the cornerstone of their quirky vision of a world resistant to human will.
But it's also the cornerstone of a thriving, mash-up culture, one that transforms even the most staid nature photography into commentaries on politics, technology and modern life: think of Confession Bear, or Religion Pigeon, or Actual Advice Mallard.
Politically, budget reduction is also the cornerstone of the detailed coalition agreement that forms the basis of the Conservative and Liberal Democratic government that took power in May 2010.
Parmenides' thesis is not only historically but also logically the cornerstone of atomistic thought.
But the bill may also form the cornerstone of future Democratic banking legislation, as the party has moved toward a raft of populist left-leaning ideas, including Medicare-for-all and free tuition at public universities.
The hands-on approach has also been the cornerstone of the laboratory management courses offered by EMBO.
Tapestry also became the cornerstone of King's career as a performer and, more recently, of her jukebox musical Beautiful, which opened in London last year.
The program also is the cornerstone of our departmental research training endeavor setting high standards for investigative training offered to medical students, residents, junior faculty, and visiting scholars who participate in the research training process.
