Definitions for "Backbone network"
A portion of an internetwork used for transit of information between different networks.
A high capacity electronic trunk connecting lower capacity networks, e.g., NSFNET backbone
n. A central network to which smaller networks, normally of lower speed, connect. The backbone network usually has a much higher capacity than the networks it helps interconnect or is a wide-area network (WAN) such as a public packet-switched datagram network.
The "trunk lines" of the Information Superhighway.