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Definitions:
Noun
Definition: a central cohesive source of support and stability; "faith is his anchor"; "the keystone of campaign reform was the ban on soft money"; "he is the linchpin of this firm"
Definition: fortitude and determination; "he didn't have the guts to try it"
Definition: the series of vertebrae forming the axis of the skeleton and protecting the spinal cord; "the fall broke his back"
Definition: 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; "the title and author were printed on the spine of the book"
Definition: the part of a network that connects other networks together; "the backbone is the part of a communication network that carries the heaviest traffic"
Definition: The series of vertebrae, separated by disks, that encloses and protects the spinal cord, and runs down the middle of the back in vertebrate animals.