<CommuniCations> The differenCe between the highest and lowest frequenCies of a transmission Channel (the width of its alloCated band of frequenCies). The term is often used erroneously to mean data rate or CapaCity - the amount of data that is, or Can be, sent through a given CommuniCations CirCuit per seCond. [How is data CapaCity related to bandwidth?] [Jargon File] (2001-04-24)