English definition of “code”
SECRET MESSAGE [C, U] › a set of letters, numbers, or signs that are used instead of ordinary words to keep a message secret: It was written in code. They were trying to break (= understand) the enemy's code.
TELEPHONE [C] UK (UK/US area code) › a set of numbers used at the beginning of all the telephone numbers in a particular area
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 → See also zip code