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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
1 Node (circuits) , a region in an electrical circuit where there is no change in potential. 2  Node (computer science) , the computer representation of a node in a graph, and a basic unit used to build data structures. 3  Goal node (computer science) , a node in a graph that meets defined criteria for success or termination. Node (autonomous system) , behaviour for an ordinary differential equation near a critical point. 2  Node (graph theory) , a vertex in a mathematical graph, or a point in a network topology at which lines intersect, branch or terminate.