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Definition of node 1 a: a pathological swelling or enlargement (as of a rheumatic joint) b: a discrete mass of one kind of tissue enclosed in tissue of a different kind
A node is a point of intersection/connection within a network. In an environment where all devices are accessible through the network, these devices are all considered nodes. The concept of nodes works on several levels, but the big-picture view defines nodes as the major centers through which Internet traffic is typically routed.