[too-ner, tyoo-]
a person or thing that tunes.
the portion of a radio or television receiver that captures the broadcast signal and feeds it to other circuits in the set for further processing.

1570–80; 1905–10 for def 2; tune + -er1

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World English Dictionary
tuner (ˈtjuːnə)
1.  a person who tunes instruments, esp pianos
2.  the part of a radio or television receiver for selecting only those signals having a particular frequency

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

"device for varying the frequency of a radio or television," 1909, from tune.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
It was dedicated to motorsports, and over time they turned into more of a tuner.
And if it isn't, the on-screen guitar tuner will help you get there.
If you have a television with a digital tuner, then you will not need a
If you haven't purchased a television in the last five years, it probably does
  not include a digital tuner.
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