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Definitions of backbone
  1. noun
    the series of vertebrae forming the axis of the skeleton and protecting the spinal cord
  2. noun
    fortitude and determination

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  3. noun
    a central cohesive source of support and stability
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  4. noun
    the part of a book's cover that encloses the inner side of the book's pages and that faces outward when the book is shelved

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  5. noun
    the part of a network that connects other networks together
    "the backbone is the part of a communication network that carries the heaviest traffic"
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