1) Broadcasting 
Rediffusion was a business which distributed radio and TV signals through wired relay networks. The business gave rise to a number of other companies, including Associated-Rediffusion, later known as Rediffusion London, one of the first companies to win a terrestrial ITV (commercial television) franchise in the UK. Rediffusion also spawned a recor...
[n] - (British) a system for distributing radio or tv programs
noun a system for distributing radio or tv programs