Definition of node in US English:



  • 1A point at which lines or pathways intersect or branch; a central or connecting point.

    • ‘Another node earmarked as a major potential destination is Soweto, where history and heritage abound.’
    • ‘Branches and nodes are color-coded to represent genetic divergences arising from speciation events.’
    • ‘NATO realized this and later disrupted electrical power by destroying transformers, distribution nodes, and transmission lines.’
    • ‘In a network the decision points are called nodes and the lines connecting nodes are called edges or paths.’
    • ‘To the east is Aegidientorplatz, a major node and traffic intersection dominated by an axially placed theatre.’
    • ‘In this model, each node would represent an individual member of a given cell, and a line linking two nodes would indicate direct communication between those two members.’
    • ‘In general, a graph consists of an array of points, or nodes, joined by line segments, which are often called edges.’
    • ‘It provided near-real-time monitoring of the flow of critical classes of supply across critical nodes and lines of communication.’
    • ‘They provided logistic sustainment to the rear areas, carrying cargo and passengers between the major nodes of the operation.’
    • ‘The question mark that labels the parent node may be intended to indicate that it is not known whether these three groups are related, but this is not clear.’
    • ‘Walden is the locus of such pilgrimages for some visitors, a node in a network of places connected by sacred geography.’
    junction, fork, branching, intersection, interchange, confluence, convergence, meeting point, crossing, criss-crossing, vertex, apex
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    1. 1.1 A piece of equipment, such as a PC or peripheral, attached to a network.
      • ‘Network nodes can be notebooks, handheld computers or other devices that accept MeshNetworks' communications card.’
      • ‘Why would anyone want to go to all the trouble of building a network of wireless internet nodes in order to deliver voice and data services when companies such as Telecom and Vodafone have already done this?’
      • ‘A plurality of computer nodes communicate using seemingly random Internet Protocol source and destination addresses.’
      • ‘The spread of cyber crimes is aided by the increased number of nodes on the Internet, increased processor speed, and readily available bandwidth.’
      • ‘With an Ethernet interface, each cable modem appears as a node on an Ethernet LAN.’
    2. 1.2Grammar (in generative grammar) a vertex or endpoint in a tree diagram.
      • ‘When you ‘read’ a tree, identify constituents by looking at all the elements that are exhaustively dominated by a single node in the tree.’
      • ‘Since each node represents an elementary segment (a terminal category), the nodes in a dependency tree are typically labeled by lexemes.’
      • ‘Each node carries three types of information: a syntactic function, a lexeme and a set of morphosyntactic features introduced by a part of speech category.’
    3. 1.3Mathematics A point at which a curve intersects itself.
      • ‘We prove this result when the curves have cusps and nodes, not in a prescribed position.’
      • ‘The slope of the chord between two nodes is the average of the slope of the tangents at the end points.’
    4. 1.4Astronomy Either of the two points at which a planet's orbit intersects the plane of the ecliptic or the celestial equator.
      • ‘If the Sun is close to one of the nodes when the Moon crosses the ecliptic, an eclipse is imminent.’
      • ‘This is because the nodes of the orbit of Venus pass across the Sun in early June at the descending node, and early December at the ascending node.’
      • ‘The nodes of an orbit, that is the points at which it crosses the equatorial plane, slowly regress round the Equator and the rate gives a measure of the asymmetry of the Earth's mass.’
      • ‘Lunar eclipses occur at the time of a Full Moon, and when the Moon is near one of the nodes of intersection between its orbit and the ecliptic plane.’
      • ‘If the lunar orbit were fixed in space, such that the nodes occurred always in the same locations, then the Sun would pass through those nodes once per solar year.’
  • 2Botany
    The part of a plant stem from which one or more leaves emerge, often forming a slight swelling or knob.

    • ‘The leaves from each node were dried and powdered separately.’
    • ‘For each plant, we recorded the number of leaf nodes producing flowers and the total fruit production.’
    • ‘In the tree there are 2 branches connecting two nodes or a tip and a node.’
    • ‘Make cuts on an angle and just above a node, where the leaf attaches to the stem.’
    • ‘Each shoot has several leaves arising from nodes located near its tip.’
    • ‘Both the stems and leaves, which occur in whorls at the node, are covered in hooks; these are thought to aid attachment to their support and allow the plant to climb without twining.’
  • 3Anatomy
    A lymph node or other structure consisting of a small mass of differentiated tissue.

    • ‘Computed tomographic scan of the chest and abdomen revealed multiple enlarged nodes in the retroperitoneum, superior mediastinum, and axillae.’
    • ‘These swollen lymph nodes appear most often in the underarm or neck areas, although if the inoculation lesion is on the leg, then the nodes in the groin will be affected.’
    • ‘Some of the calcium channel blockers also exert an inhibitory effect on the sinus and atrioventricular nodes, causing the heart rate to slow.’
    • ‘Even small lung cancers show mediastinal node involvement.’
    • ‘Fixed, firm, or matted lymph nodes and nodes larger than 1.5 cm require further evaluation.’
    • ‘In general, rate-responsive devices are preferred because they more closely simulate the physiologic function of the sinus node.’
  • 4Physics Mathematics
    A point at which the amplitude of vibration in a standing wave system is zero.

    • ‘Here a beam selectively pushes one size of particles toward a standing light wave, which directs the particles toward its nodes.’
    • ‘While in St Petersburg he made one of his most famous discoveries when he defined the simple nodes and the frequencies of oscillation of a system.’
    1. 4.1 A point at which a harmonic function has the value zero, especially a point of zero electron density in an orbital.
      • ‘Consider a random walk on a graph where at each time point we move from the current node to one of its neighbors.’
    2. 4.2 A point of zero current or voltage.
      • ‘Two measurement pads are in each case provided at the nodes between two resistors.’
      • ‘The first switch group is formed by switches, which are connected to nodes between the resistors.’


Late Middle English (denoting a knotty swelling or a protuberance): from Latin nodus ‘knot’.