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Word of the Day Wednesday, June 10, 2026

codebook

/kɒudbʊk/ noun · British & US
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What does codebook mean?

noun

A book or document that contains a list of codes, especially a set of rules or instructions for encoding or decoding messages. A codebook is often used in cryptography to store encryption keys or algorithms.

Example

"The cryptographer used a codebook to decode the encrypted message."

Definition generated by AI and curated by RJS Tech Solutions LLP.

Synonyms for codebook

Rhymes with codebook

Etymologically related