The term “cornerstone” has both a literal and metaphorical meaning:
Literal Meaning: A cornerstone is the first stone set during the construction of a building, often placed at the foundation. It is traditionally positioned at a corner and serves as a symbolic or structural starting point for the rest of the construction. In historical contexts, it was sometimes inscribed with important information like the date of construction, the builder’s name, or a dedication.
Metaphorical Meaning: The word cornerstone is often used metaphorically to refer to something that is essential, foundational, or crucial to the success or functioning of something larger. For example:
“Trust is the cornerstone of a successful relationship.”
“Education is the cornerstone of a thriving society.”