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code (n.)

c. 1300, "systematic compilation of laws," from Old French code "system of laws, law-book" (13c.), from Latin codex"systematic classification of statutory law," earlier caudex "book," literally "tree trunk," hence, book made up of wooden tablets covered with wax for writing. De Vaan traces this through Proto-Italic *kaud-ek- to PIE *kehu-d- "cleaved, separate," which he also sees as the root of cauda "tail" (see coda).

Meaning "cipher, system of signals and the rules which govern their use" (the sense in secret code) is from 1808. Code-name is from 1879 (in telegraphy). Meaning "system of expressing information and instructions in a form usable by a computer" is from 1946.

code (v.)

"to put into code," 1815, from code (n.). Specifically "to put into computer code" from 1947. Intransitive sense "write computer code" is by 1987. Related: Coded; coding.

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Definitions of code from WordNet
1
code (n.)
a set of rules or principles or laws (especially written ones);
Synonyms: codification
code (n.)
a coding system used for transmitting messages requiring brevity or secrecy;
code (n.)
(computer science) the symbolic arrangement of data or instructions in a computer program or the set of such instructions;
Synonyms: computer code
2
code (v.)
attach a code to;
code (v.)
convert ordinary language into code;
Synonyms: encipher / cipher / cypher / encrypt / inscribe / write in code
From wordnet.princeton.edu