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English definition of “backbone”

backbone

noun [C, usually singular]     /ˈbækbəʊn/
the backbone (of sth) the most important part of something: Small businesses are truly the backbone of the economy . Imaginative ideas may form the backbone of your progress in the future .
COMMUNICATIONS, IT the system of equipment and connections that allows communication at high speeds over long distances : The company runs the biggest internet backbone in the US, carrying about 37% of data traffic .
(Definition of backbone noun from the Cambridge Business English Dictionary © Cambridge University Press)
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