In the science of waves, a node is a point of minimum displacement (zero amplitude) on a standing wave, such as the stationary points on a vibrating string. See also
In celestial mechanics, a node is either of the points on the celestial sphere at which the plane of an orbit intersects a reference plane. The position of a node is one of the standard orbital elements used to specify the orientation of an orbit. An antinode lies 90° of orbital longitude away from its corresponding node. See ascending node and descending node.
In anatomy, a node is thickening or enlargement of an organ or tissue, such as a lymph node or the sinoatrial node in the heart.
In botany, the position on the stem of a plant from which a leaf or leaves grow.
In analytical geometry, a point of intersection of two or more parts of a single curve.
In information processing and telecommunications, a junction or connection point in a network, e.g., a terminal or a computer.
In the physics of waves, an antinode is a point, line, or surface in a standing wave where some characteristic of the wave field has maximum amplitude. A standing, or stationary, wave is one whose shape stays the same and that doesn't appear to move through a medium. It occurs when a traveling wave is reflected along its own path. Antinodes and nodes are separated by a quarter of a wavelength.
In celestial mechanics, an antinode is either of the two points on an orbit where a line in the orbit plane, perpendicular to the line of nodes, and passing through the focus, intersects the orbit.