a person who decodes messages or the like.
a device for decoding cryptograms, codes, or the like, as an electric or electronic apparatus that transforms arbitrary input signals into letters, words, etc.
Navigation. an electronic circuit designed to respond only to certain signals and to reject others.
Computers. a circuit designed to produce a single output when actuated by a certain combination of inputs.
Television. a box attached to a television set containing circuitry to unscramble encoded signals, as cable-television programs or closed captions, so that the signals can be displayed on the screen.

1915–20; decode + -er1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
decode (diːˈkəʊd)
1.  to convert (a message, text, etc) from code into ordinary language
2.  computing Compare encode to convert (coded characters) from one form to another, as from binary-coded decimals to decimal numbers
3.  electronics to convert (a coded electrical signal) into normal analogue components
4.  to analyse and understand the construction of words and phrases, esp in a foreign language

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Science Dictionary
decoder   (dē-kō'dər)  Pronunciation Key 
An electronic or software device that converts telecommunication signals from their transmitted form into a form interpretable to other devices or to human beings.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Visual decoder allows researchers to translate brain wave activity into images.
They were given ten seconds, during which time the scientists ran the firing of the relevant neurons through a decoder.
There's not some super secret double nought spy club with beanies and secret decoder rings.
For a television receiver to display closed captions, it must use a set-top box decoder or contain integrated decoder circuitry.
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