fundament

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"
  2. The fleshy part of the human body that you sit on (synset 105566889)
    "he deserves a good kick in the butt"; "are you going to sit on your fanny and do nothing?"
  3. Lowest support of a structure (synset 103391862)
    "it was built on a base of solid rock"; "he stood at the foot of the tower"

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