A cornerstone was a stone or brick that was placed in the corner of a structure.
The cornerstone of every building in the Caldos colony came from various places in Scotland, including the cities of Edinburgh, Glasgow, and Aberdeen. Maturin explained to Jean-Luc Picard in 2370 that it was done so that the colonists could "feel they had a piece of the real thing here". (TNG: "Sub Rosa")
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