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1. Based on common law
   "a common-law right"

1. (civil law) a law established by following earlier judicial decisions
   - case law, precedent
    
2. (law) a system of jurisprudence based on judicial precedents rather than statutory laws
   "common law originated in the unwritten laws of England and was later applied in the United States";
   - case law, precedent

See also: unwritten

Type of: civil law, jurisprudence, law

Encyclopedia: Common-law