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plural cornerstones
A stone forming the base at the corner of a building. examples
Such a stone used ceremonially, often inscribed with the architect's and owner's names, dates and other details. examples
(figuratively) That which is prominent, fundamental, noteworthy, or central. quotations examples
Jewish immigrants came together with other foreign-born groups in organizations like the Industrial Workers of the World, helping to create one of the cornerstones of the American left.
2019 July 15, Greg Afinogenov, “The Jewish Case for Open Borders”, in Jewish Currents, number Summer 2019