cornerstone

Noun
  1. The fundamental assumptions from which something is begun or developed or calculated or explained (synset 105801562)
    "the whole argument rested on a basis of conjecture"
    is a type of: assumption, supposal, supposition - a hypothesis that is taken for granted
    subtypes: meat and potatoes - the fundamental part
    is a part of: explanation - thought that makes something comprehensible
    same as: base, basis, foundation, fundament, groundwork
  2. A stone in the exterior of a large and important building;
    Usually carved with a date and laid with appropriate ceremonies (synset 103115121)
    is a type of: stone - building material consisting of a piece of rock hewn in a definite shape for a special purpose
    is a part of: building, edifice - a structure that has a roof and walls and stands more or less permanently in one place
  3. A stone at the outer corner of two intersecting masonry walls (synset 103114983)
    is a type of: stone - building material consisting of a piece of rock hewn in a definite shape for a special purpose
    is a part of: building, edifice - a structure that has a roof and walls and stands more or less permanently in one place

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