Definition
Spanish legal term meaning "judged thing" or "matter adjudged." The civil law equivalent of the common law doctrine of res judicata: once a competent court has rendered a final judgment on the merits of a dispute, that judgment is conclusive between the parties as to the matter decided and cannot be relitigated. The term appears in Spanish-derived legal systems and in historical American sources drawn from Spanish colonial law.
Common Confusion
COSA JUZGADA vs. RES JUDICATA: These terms describe functionally equivalent doctrines, but they are not interchangeable in all research contexts. Res judicata is the operative term in common law jurisdictions and in most modern American federal and state courts. Cosa juzgada appears in sources rooted in Spanish civil law tradition and in historical legal materials from jurisdictions where Spanish law applied — including Louisiana, Texas, California, Florida, and the former territories of the American Southwest. Treating them as identical can cause a researcher to miss doctrinal nuance: the civil law tradition underlying cosa juzgada sometimes draws the line between claim preclusion and issue preclusion differently than common law res judicata doctrine does, and the procedural conditions triggering preclusion may vary.
Why It Matters in Research
The primary research value of this term is jurisdictional and historical, not doctrinal. Researchers working in the Law Mind corpus will encounter cosa juzgada most often in three contexts:
First, in materials from states with Spanish legal heritage — particularly Louisiana, Texas, California, New Mexico, Arizona, and Florida — where Spanish and later Mexican law governed before American acquisition. Early territorial and state court decisions in these jurisdictions may invoke cosa juzgada directly, sometimes without cross-referencing common law res judicata authority at all. Researchers accustomed to common law terminology may not recognize the term or appreciate that it carries full preclusive force.
Second, in treatises and digests covering Spanish colonial law and the Recopilación de las Indias or its successors. White's New Recopilación, cited in all three source dictionaries, is the standard English-language reference for this body of law; researchers should expect historical dictionaries to route back to that source rather than to English common law authority.
Third, in comparative law materials and international commercial arbitration, where Spanish-speaking jurisdictions apply cosa juzgada as a substantive standard for recognizing and enforcing foreign judgments.
A significant trap: in historical American sources from Spanish-heritage jurisdictions, cosa juzgada may be used loosely to describe either what common law calls claim preclusion (the entire cause of action is barred) or issue preclusion (collateral estoppel on a specific finding). The civil law tradition did not always maintain this distinction with the same precision as modern common law doctrine does. Do not assume that a historical court invoking cosa juzgada was invoking the full scope of modern res judicata.
Historical Dictionary Support
All three source dictionaries offer minimal entries, converging on a single-sentence gloss: cosa juzgada means "a cause or matter adjudged" and is the Spanish law equivalent of res judicata. All three cite White's New Recopilación as their authority. Burrill adds the secondary citation White's New Recop. b. 3, tit. 9, c. 1, slightly expanding the textual basis.
None of the historical dictionaries address the procedural conditions for invoking cosa juzgada, the distinction between its claim-preclusive and issue-preclusive effects, or its interaction with American common law doctrine when Spanish-heritage jurisdictions were absorbed into the United States. This is a meaningful gap. Researchers relying solely on historical dictionary entries will have confirmed the term's translation and general equivalence to res judicata but will have no guidance on how courts actually applied it or how it was reconciled with incoming common law doctrine in post-acquisition territorial courts.
The first edition of Black's contains a corrupted entry — the definition of cosa juzgada runs together with fragments from a different entry on corruption of officials, reflecting a typesetting or scanning error in the digitized source. Researchers should rely on the second edition or Burrill for a clean text.
Jurisdictional Note
Cosa juzgada retains active legal significance in civil law countries, including Spain, Mexico, and most of Latin America, where it is codified in civil procedure statutes. In United States courts, it functions primarily as a historical or comparative reference term; modern American courts from Spanish-heritage states apply res judicata doctrine under common law or codified rules without typically using the Spanish term. Researchers working on cross-border disputes involving Mexican or Latin American judgments may encounter the term in enforcement proceedings.
Encyclopedia Cross-Reference
See Law Mind Encyclopedia — Res Judicata
See Law Mind Encyclopedia — Spanish and Civil Law Heritage Jurisdictions