Definitions

1. noun

a stone or brick at the corner of a building, typically the first stone laid in a construction project.

“The mayor laid the cornerstone of the new library building.”

2. noun

a fundamental principle or aspect of a concept, theory, or system.

“Education is the cornerstone of a successful society.”

3. verb

to establish or form the basis of something.

“The new policy will cornerstone a more sustainable future for the company.”