codebook
nounUK /ˈkəʊdbʊk/
US /ˈkoʊdbʊk/
A codebook is a book that lists special codes and what they mean.
The spy used a codebook to read the secret message.
RELATED WORDS
OTHER MEANINGS
2. A set of rules for turning information into a secret code.
The team wrote a codebook so only members could understand their notes.
3. A list of codes used to label data in a study or survey.
Researchers checked the codebook to see what each answer number meant.
4. A book of standards or rules for a particular subject.
The builders followed the building codebook carefully.