cornerstone
This term evokes the image of a structural anchor that ensures the stability and alignment of an entire building. When used figuratively, it describes an indispensable element that supports a larger system, theory, or belief, suggesting that if this single piece were removed, the entire structure would collapse. In a physical sense, the word refers to a specific architectural ritual. It carries a connotation of beginning and permanence, often associated with official ceremonies and the historical marking of a building's origin.
Meanings
A fundamental principle, rule, or feature upon which something is based or developed.
"The right to free speech is the cornerstone of a democratic society."
The first stone set in the construction of a masonry foundation, often used as a ceremonial marker.
"The mayor joined the architects to lay the cornerstone of the new city hall."