Full Definition of NETWORK. 1. : a fabric or structure of cords or wires that cross at regular intervals and are knotted or secured at the crossings. 2.: a system of lines or channels resembling a network. 3. b: a system of computers, peripherals, terminals, and databases connected by communications lines. 4.weet. : a system of lines, wires, etc., that are connected to each other. : a system of computers and other devices (such as printers) that are connected to each other. : a group of people or organizations that are closely connected and that work with each other.