From Legal Wiki
Literally, it means a matter adjudged, a thing judicially acted upon or decided; a thing or matter settled by judgment. In res judicata, the judgment in the first action is considered conclusive as to every matter offered and received therein, as to any other admissible matter which might have been offered for that purpose, and all other matters that could have been adjudged therein. Res judicata is an absolute bar to a subsequent action for the same cause; and its requisites are: (a) the former judgment or order must be final; (b) the judgment or order must be one on the merits; (c) it must have been rendered by a court having jurisdiction over the subject matter and parties; (d) there must be between the first and second actions, identity of parties, of subject matter and of causes of action.
- ↑ Mirpuri vs. CA, G.R. No. 114508, 19 November 1999