How much can pass at once. Used of channels and of minds — in both, exceeding it does not slow things, it drops them.
A 20th-century engineering compound of BAND (Old Norse band, a binding, extended to a range of a spectrum) and WIDTH (Old English widu, breadth); how much can pass at once.
How much can pass at once, in a channel or in a mind; exceeding it drops rather than slows.