1. the slightly enlarged portion of the stem from which branches, leaves, or flowers originate —see whorl 2. GIS the beginning and ending locations of an arc 3. GIS the location where lines connect 4. graph theory the location at which three or more lines connect 5. computers the point at which one computer attaches to a communication network 6. the three corner points of each triangle in a triangulated irregular network (TIN); every sample point input to a TIN becomes a node in the triangulation; a triangle node is topologically linked to all triangles that meet at the nodeThis definition last updated 07/10/2008