collateral estoppel; issue preclusion
A legal doctrine preventing a party from relitigating an issue already decided in a prior case. Used in Japanese civil procedure.
For key issues decided in a prior lawsuit, issue preclusion applies in a subsequent suit.
Compound of 争点 (issue in dispute) and 効 (effect, efficacy), literally 'issue effect'. A modern legal term calqued from English 'collateral estoppel' or 'issue preclusion'.