set-top box ˈset-top ˌbox noun [countable]
a piece of equipment that allows you to use the Internet on your television, and to receive digital television
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set-top box UK US noun [C] COMMUNICATIONS
► a piece of electronic equipment that makes it possible to watch digital television, to use the internet on ordinary televisions, or to connect to cable or satellite television programmes: »
The company distributes movies over the web via set-top boxes plugged into TVs.
Financial and business terms. 2012.