CORNERSTONE

• (noun) a stone at the outer corner of two intersecting masonry walls

• (noun) a stone in the exterior of a large and important building; usually carved with a date and laid with appropriate ceremonies

• (noun) the fundamental assumptions from which something is begun or developed or calculated or explained

  "the whole argument rested on a basis of conjecture"

  synonyms : base , basis , foundation , fundament , groundwork

WordNet® 3.0, © 2006 by Princeton University.

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