mastered means: The term mastered can be used to describe the audio and music industries. This is a term that refers to a song in its final stages before it is mass produced or sold. Mastered songs are stereo tracks that have been edited by mastering engineers who use their skills and equipment to make a mix more alive. It can be fattening, adding volume and depth to the mix while also bringing out specific parts. example – vocals. (in Community Dictionary, added by Jairo Downs)