Real Dictionary

broadband
Broadband is a method of sending many electronic messages at the same time, using a wide range of frequencies.

broadband in American English
designating or of cable, communications devices, etc. that can carry a wide range of frequencies or many channels of data allowing large amounts of information to be transmitted at high speeds
adjective: of, pertaining to, or responsive to a continuous, wide range of frequencies
noun: the continuous transmission of electronic data over a wide range of frequencies

broadband in British English
noun: a transmission technique using a wide range of frequencies that enables messages to be sent simultaneously, used in fast internet connections

broadband in Electrical Engineering
noun: Broadband is a transmission medium with enough bandwidth to carry multiple voice, video, or data channels at the same time.