1 noun
net‧work1 W3 [countable]
1 a system of lines, tubes, wires, roads etc that cross each other and are connected to each other:
a high-speed European rail network
network of
an elaborate network of canals
the network of blood vessels in the body
2TCBAMT a group of radio or television stations, which broadcast many of the same programmes, but in different parts of the same country:
the four biggest TV networks
You're listening to the American Armed Forces Network.
3TDTDTC a set of computers that are connected to each other so that they can share information
4 a group of people, organizations etc that are connected or that work together
network of
It's important to build up a network of professional contacts.

➔ the old-boy network

at old boy (2)