• Node (autonomous system), behaviour for an ordinary differential equation near a critical point
• Node (botany), the place on a plant stem where a leaf is attached
• Node (Doctor Who), a cyborg with a donated human face that is used as a guide in the universe's largest library. See Silence in the Library
• Node (physics), a spatial locus along a standing wave where the wave has minimal amplitude
• Node (orbital mechanics): the point where an orbit crosses the equator; see Ascending node
• Node (networking), point in a computer network.
• Node (telecommunications), an originating or terminating point of information transfer in a telecommunications network
• Node (mathematics), a vertex in a graph, connecting two or more edges
• Node (networking), a device connected to a network, such as a computer or router
• Node (computer science), a basic unit used to build data structures such as linked lists and trees
• Node (circuits), a region in an electrical circuit where there is no change in potential
• Transport node
• Node (computer gaming), a particular style of adventure game
• Node Magazine, a literary project based on the novel Spook Country by William Gibson

Node may also be:

• Artificial neuron, a basic unit in neural networks
• Vertex, one of the components of a graph
• A value that's used for function interpolation

Nodal may refer to:

• Nodal, a protein involved in TGF beta signaling.

See also

• In other languages, the words for some meanings of "node" and "knot" are the same.