Organized and written down in an official code or system of rules; the past tense of codify.
From 'codify' (to organize into a code). The verb comes from 'code' and '-ify' (to make into), dating to the 18th century.
Written constitutions are codified rules, but Britain famously operates without one—its laws evolved piecemeal, showing that not all functioning governments need everything written down.
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