| code | (noun) a coding system used for transmitting messages requiring brevity or secrecy | - |
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| (noun) a set of rules or principles or laws (especially written ones) | Synonyms: codification |
| (noun) (computer science) the symbolic arrangement of data or instructions in a computer program or the set of such instructions | Synonyms: computer code |
| (noun) a series of letters, numbers or symbols assigned to something for the purpose of classification or identification | - |
| codefendant | (noun) a defendant who has been joined together with one or more other defendants in a single action | Synonyms: co-defendant |
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| codeine | (noun) derivative of opium; used as an antitussive (to relieve coughing) and an analgesic (to relieve pain) | - |
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| coder | (noun) a person who designs and writes and tests computer programs | Synonyms: computer programmer, programmer, software engineer |
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| codetalker | (noun) a secret agent who was one of the Navajos who devised and used a code based on their native language; the code was unbroken by the Japanese during World War II | Synonyms: windtalker |
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| codex | (noun) an unbound manuscript of some ancient classic (as distinguished from a scroll) | Synonyms: leaf-book |
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| (noun) an official list of chemicals or medicines etc. | - |