cornerstone
corner|stone /k'ɔːrnərstoʊn/ (cornerstones)
also corner-stone
[N-COUNT] oft N of n
The cornerstone of something is the basic part of it on which its existence, success, or truth depends. (FORMAL)
Research is the cornerstone of the profession.
= keystone
also corner-stone
[N-COUNT] oft N of n
The cornerstone of something is the basic part of it on which its existence, success, or truth depends. (FORMAL)
Research is the cornerstone of the profession.
= keystone