Definition of Cornerstone
Noun
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a stone at the outer corner of two intersecting masonry walls
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a stone in the exterior of a large and important building
usually carved with a date and laid with appropriate ceremonies
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the fundamental assumptions from which something is begun or developed or calculated or explained
"the whole argument rested on a basis of conjecture"
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.