Definition of res judicata
: a matter finally decided on its merits by a court having competent jurisdiction and not subject to litigation again between the same parties
Origin of res judicata
Latin, judged matter
First Known Use: 1693
Learn More about res judicata
Britannica.com: Encyclopedia article about "res judicata"
Seen and Heard
What made you want to look up res judicata? Please tell us where you read or heard it (including the quote, if possible).