Meaning of fader

fad•er

Pronunciation: (fā'dur), [key]
— n.
  1. a person or thing that fades.
  2. a multiple-unit volume control used in changing gradually from one signal source to another, decreasing the volume from the first audio or visual source while increasing the volume from the second.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.