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Meaning of “code” - Learner’s Dictionary

code

noun     /kəʊd/
SECRET MESSAGE [C, U]
B2 a set of letters, numbers, or signs that are used instead of ordinary words to keep a message secret: The message was written in code. They were trying to break (= understand) the enemy's code.Codes and decodingSigns, signals and symbols
TELEPHONE [C] UK ( UK/US area code)
a set of numbers used at the beginning of all the telephone numbers in a particular areaCommunicating by telephone
RULES [C]
a set of rules on how to behave or how to do things: a code of conduct/practice The club has a strict dress code (= rules about what you wear). →  See also bar code , zip code Morality and rules of behaviourPhilosophyRules and laws
(Definition of code from the Cambridge Learner’s Dictionary © Cambridge University Press)
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