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(1) A simple queueing subsystem in a queueing network consisting of a server center with one or more servers, a queueing capacity infinite or finite, and a queue discipline. (2) An element of a graph or network, pairs of which are connected by arcs or edges. Nodes are sometimes referred to as points or vertices. Graph theory; Network optimization. (3) Shown graphically in a project network plan as a circle depicting the beginning or end of an activity. A node represents an instantaneous point in time at the junction of arrows. Network planning.