Res Judicata
legal term /reɪz ˌdʒuː.dɪˈkɑː.tə/ — A matter already adjudicated that cannot be litigated again
Definition
A matter that has been definitively adjudicated by a court and cannot be litigated again by the same parties. Res judicata is finality made law — the case is over, the decision stands.
Beyond the definition
Res judicata is the word for legal finality — the decision that cannot be reopened. It embodies one of law's most important values: certainty. Without it, no dispute ever truly ends; with it, even unjust outcomes become stable foundations.
Origin & history
Latin: 'a thing adjudicated'. From res (thing, matter) + judicata (adjudicated, judged). A fundamental principle of civil procedure preventing the relitigation of already-decided matters.
Example sentences
Illustrative sentences for learning, not verified community posts or sourced quotations.
The court dismissed the claim under res judicata — the identical issue had been decided three years earlier.
Res judicata ensures that legal disputes eventually end, even if not everyone is satisfied.
The doctrine of res judicata is why finality matters in law, even when a decision was wrong.
How to use it
Follow this entry’s examples for grammatical form and sentence placement.
Choose “Res Judicata” when the meaning fits your context: A matter that has been definitively adjudicated by a court and cannot be litigated again by the same parties. Res judicata is finality made law — the case is over, the decision stands.
Synonyms
thing decided, final judgment, decided matter
Antonyms
open case, pending matter, relitigable
Related words
Res Judicata vs stare decisis
Res judicata prevents a party from relitigating a specific resolved case. Stare decisis is the doctrine of following past judicial decisions as a general principle of precedent.
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Word in the Wild
See how this word appears in life, language and stories.
Illustrative sentences and imagined stories for learning — not verified sightings, interviews, or sourced quotations.
Fictional scene
Finality of Legal Processes
An adult stands in a quiet, grand courtroom holding a single document, emphasizing legal weight.
The setting depicts the gravity of the legal system, where once an official decision is reached, it serves as res judicata. The finality of the courtroom environment mirrors how a legal matter, once adjudicated, is formally concluded and settled for all parties.
Image credit: Wordspun · AI-generated conceptual illustration
Questions about this word
What does "Res Judicata" mean?
Res Judicata is legal term meaning: A matter already adjudicated that cannot be litigated again. A matter that has been definitively adjudicated by a court and cannot be litigated again by the same parties. Res judicata is finality made law — the case is over, the decision stands.
Where does the word "Res Judicata" come from?
Latin: 'a thing adjudicated'. From res (thing, matter) + judicata (adjudicated, judged). A fundamental principle of civil procedure preventing the relitigation of already-decided matters.