1. devices or programs that convert coded information into a readable or usable form
Usage: technology; computing
2. people who interpret or figure out the meaning of coded messages or signals

Examples

• The military used special decoders to read enemy communications.
• Video decoders convert compressed files into watchable formats.
• The spy agency hired expert decoders to crack the secret messages.
• Modern smartphones have built-in audio decoders for different file types.
• The archaeologists worked as decoders, translating ancient scripts.
• Digital TV requires decoders to process the broadcast signals.