Definition
A Latin term from Roman civil law meaning to pass a law contrary to an existing law, or contrary to some clause of it — that is, to modify or partially supersede a prior law by enacting legislation inconsistent with it. Obrogare describes a particular legislative act: not the outright repeal of a prior statute, but the introduction of a conflicting provision that displaces or alters the earlier law in some specific part. The effect is partial rather than total supersession.
Common Confusion
Obrogare is one of several Latin terms describing the relationship between old and new legislation, and researchers frequently conflate them. The classical civil law distinguished four related concepts: obrogare (passing a law contrary to a prior law, amending it in part); abrogare (repealing a law entirely); derogare (partially repealing or impairing a law); and subrogare (substituting a new provision in place of an old one). These distinctions matter because historical legal texts use them with precision. Seeing abrogare where a source means obrogare — or treating the two as synonyms — can distort understanding of whether a prior rule was wholly extinguished or only modified. Modern legal English collapsed most of these distinctions into "repeal," "amendment," and "modification," so the granularity is largely lost outside civilian scholarship.
Why It Matters in Research
Obrogare appears almost exclusively in historical sources dealing with Roman law, civil law jurisdictions, or early common law scholarship that borrowed civilian vocabulary. Researchers are most likely to encounter it in treatises on statutory interpretation, legislative theory, or the reception of Roman law into European and Anglo-American legal thought.
The critical research trap is treating obrogare as equivalent to full repeal. When a historical source says a law was obrogate, the prior law was not abolished — it remained operative except where the new enactment conflicted with it. This distinction has real interpretive weight when tracing the development of a legal rule through successive layers of legislation in civilian-influenced systems.
In the Law Mind corpus, obrogare is most likely to surface in: (1) civil law treatises and commentaries drawing on Roman sources; (2) early English common law scholarship engaging with civilian learning; (3) works on statutory construction that survey the Latin vocabulary of legislative supersession. The term is essentially absent from modern American or English case law and statutes, where it would be anachronistic. Researchers following a doctrinal thread that passes through civilian or mixed-jurisdiction sources should be alert to the full family of cognate terms (see COMMON CONFUSION, above) to avoid misreading the scope of any legislative change being described.
Historical Dictionary Support
Black's Law Dictionary (both the first and second editions) provides identical, brief entries, each attributing the definition to "Calvin" — a reference to Johannes Calvinus (Jean Calvin the jurist, not the theologian), whose Lexicon Juridicum Iuris Caesarei simul et Canonici was a standard reference for Latin legal terminology. Burrill's Law Dictionary is marginally more informative: it supplies the etymological roots (ob, privative, and rogare, to pass a law) and adds a citation to Taylor's Elements of the Civil Law (p. 155) alongside the Calvinus reference, giving researchers two paths into the primary civilian literature.
All three sources are in agreement on the definition and offer no divergent interpretations. None of them elaborates on the practical distinction between obrogare and its sibling terms with any depth, which is a genuine gap — the entry in each dictionary is essentially a gloss rather than an analysis. Researchers who need to understand how Roman jurists and later civilians actually applied the concept should go beyond these dictionary sources to the civilian treatise literature, particularly works on Roman public law and legislative theory.
Jurisdictional Note
Obrogare is a term of Roman civil law and carries no independent operative meaning in modern common law jurisdictions. It retains relevance in civil law scholarship and in Louisiana, Quebec, and other mixed or civilian jurisdictions where civilian legal vocabulary occasionally appears in historical sources and academic commentary.