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Longman Dictionary of Contemporary English
code word
noun
EXAMPLES FROM CORPUS
▪ Each employee has a code word, which the computer's voice recognition chip checks.
▪ Essentially, each code word is a separate, highly specialized entity.
▪ Excellence becomes a code word for retreat from equity.
▪ If it had a name, or a code word, well that sounds like civil servants playing games.
▪ Occasionally, the code word has to be changed because it has been compromised.
▪ Previously the code word for this was Trine and before that, during the early 1960s, Dinar.
▪ Suppose I forget the code word.
Wikipedia
Code word

In communication, a code word is an element of a standardized code or protocol. Each code word is assembled in accordance with the specific rules of the code and assigned a unique meaning. Code words are typically used for reasons of reliability, clarity, brevity, or secrecy.

Code word (disambiguation)

A Code word may refer to:

  • Code word (figure of speech), a term chosen for propaganda value
    • "Code word", a rhetorical device used in political propaganda
  • Code word, in cryptography and telecommunications
    • a procedure word in voice communication
    • a term from the police ten-code system.
    • an element of a codebook designed so that the meaning of the code word is opaque without the code book
    • code name, a clandestine name or cryptonym used to identify sensitive information
Code word (figure of speech)

A code word is a word or a phrase designed to convey a predetermined meaning to a receptive audience, while remaining inconspicuous to the uninitiated. For example, a public address system may used to make an announcement asking for " Mr Sands" to attend a particular area, which staff will recognise as a code word for fire, and the general public will ignore.

Usage examples of "code word".

Need a sit rep and hawkeye,' he said, using the radio code word for grid coordinates.

You'd have to capture a pocket computer intact, and even that wouldn't help for long, since the code word meanings changed from day to day and unit to unit.

After receiving those, it sent a code word back, directly to the home computer, and asked for a matching word from the code disk.

Inside its chest, where an animal's heart and lungs would be, was a small cargo compartment, and at a code word from Harry, the door of this came open.

What exactly was going on, behind the mysterious code word, was a challenging question.