Neuter of a presumed derivative of krites; a rule of judging ("criterion"), i.e. (by implication) a tribunal -- to judge, judgment (seat).
see GREEK krites
1. properly, the instrument or means of trying or judging anything; the rule by which one judges (Plato, Plutarch, others).
2. the place where judgment is given; the tribunal of a judge; a bench of judges: plural, 1 Corinthians 6:2; James 2:6 (the Sept.; Plato, Polybius, Plutarch, others).
3. in an exceptional usage, the matter judged, thing to be decided, suit, case: plural 1 Corinthians 6:4 (this sense is denied by many; cf. e. g. Meyer on 1 Corinthians 6:2).