Source : Webster's Revised Unabridged Dictionary (1913)

Tuner \Tun"er\, n.
   One who tunes; especially, one whose occupation is to tune
   musical instruments.

Source : WordNet®

tuner
     n 1: someone who tunes pianos [syn: {piano tuner}]
     2: an electronic receiver that detects and demodulates and
        amplifies transmitted signals [syn: {radio receiver}, {receiving
        set}, {radio set}, {radio}, {wireless}]