1. a central cohesive source of support and stability
2. fortitude and determination
3. the series of vertebrae forming the axis of the skeleton and protecting the spinal cord
- the fall broke his back
Definition categories: body
4. 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
Similar word(s): spine
5. the part of a network that connects other networks together
- the backbone is the part of a communication network that carries the heaviest traffic
Sentences with backbone as a noun:
- Before automobiles, railroads were a backbone of commerce.
- He would make a good manager, if he had a little more backbone.