multifrequency

adjective

mul·​ti·​fre·​quen·​cy ˌməl-tē-ˈfrē-kwən(t)-sē 

-ˌtī-

1

of an electronic device : generating or receiving multiple frequencies

a multifrequency radio

2

: involving, containing, or composed of multiple frequencies

… the new multifrequency noise is being heralded as better at alerting workers to the hazards of a reversing truck.

—Brendan McAleer

Word History

First Known Use

1893, in the meaning defined at sense 1