broad‧band /ˈbrɔːdbænd $ ˈbrɒːd-/ noun [uncountable]

1. technical a system of sending radio signals, that allows several messages to be sent at the same time

2. a system of connecting computers to the Internet and moving information, such as messages or pictures, at a very high speed
—broadband adjective [only before noun]:
broadband communications

[TahlilGaran] Dictionary of Contemporary English ▲