Custom and common usage override the unwritten law, if it is special, and explain the written law, if the law is general.
Definition of Consuetudo Et Communis Assuetudo Vincit Legem Non Scriptam Si Sit Specialis Et Interpretatur Legem Scriptam Si Lex Sit Generalis
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Definitions from Black's Law Dictionary: 2nd Edition and Ballentine's Law Dictionary as are available for each term in each dictionary.