cornerstone
cor·ner·stone [cornerstone cornerstones] BrE [ˈkɔːnəstəʊn] NAmE [ˈkɔːrnərstoʊn] noun
1. (especially NAmE)a stone at the corner of the base of a building, often laid in a special ceremony
2. the most important part of sth that the rest depends on
•This study is the cornerstone of the whole research programme.
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