- The simultaneous broadcasting of the same program over two different transmission systems. For example, an AM and an FM station transmitting the same program at the same time, or the concurrent transmission of DTV content along with regular TV content.
- The simultaneous broadcasting of the same program over two or more stations utilizing the same transmission system. For example, the same TV content presented at the same time over multiple networks.
- noun a situation in which a programme is broadcast on two channels at the same time, e.g. analogue and digital, or a television channel and a radio station.