Longman Dictionary of Contemporary English homepage

coded

 adjective
     
cod‧ed
1 coded information uses a system of words, letters or symbols instead of ordinary writing so that it can only be understood by someone else who knows the system:
He sent a coded message to CIA headquarters.
2 having a set of numbers, letters, or symbols to show what something is or give information about it:
The wires are colour coded for easy identification.
3 coded language expresses your opinion in an indirect way because it will probably offend someone:
They voiced their criticism in coded statements.
4 technical coded sounds or signals can only be understood by special machines:
coded signals broadcast by the BBC radio transmitters
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
 
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