1. a book containing a system of symbols, letters, or words used to represent others for secrecy or brevity in communication
2. a reference book that explains the coding system used in data collection or research
Usage: research; statistics

Examples

• The spy carried a secret codebook to decipher encrypted messages.
• Military communications relied on an updated codebook each month.
• The research team created a codebook to standardize their survey responses.
• Without the codebook, the statistical data was impossible to interpret.
• The telegraph operator consulted his codebook to send the abbreviated message.
• Each variable in the dataset was clearly defined in the codebook.