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Definition of backbone
1the series of vertebrae extending from the skull to the pelvis; the spine. Biochemistry the main chain of a polymeric molecule. 2the chief support of a system or organization; the mainstay:these firms are the backbone of our industrial sector strength of character; firmness:he has the backbone to see us through this difficulty 3 Computing
& Telecommunications a high-speed, high-capacity digital connection which forms the axis of a local or wide area network.