📒 a complicated system of roads, lines, tubes, nerves, etc. that are connected to each other and operate together
📒 a closely connected group of people, companies, etc. that exchange information, etc.
📒 a number of computers and other devices that are connected together so that equipment and information can be shared
📒 a group of radio or television stations in different places that are connected and that broadcast the same programmes at the same time
📒 the situation in many British companies, government departments and branches of the armed forces where people give jobs to former students of the school or university that they went to