From Longman Dictionary of Contemporary Englishmistrialmis‧tri‧al /ˌmɪsˈtraɪəl/ noun [countable] SCTa trial in a court of law which is unfair, so that a new trial has to be held The judge declared a mistrial.
Examples from the Corpus
mistrial• On July 26 the two were ordered to be retried after a mistrial was declared.• Only on one count, against Powell, was the jury unable to reach a decision and a mistrial declared.• Barnhill saw no course but to declare a mistrial.• Yes, the judge said in declaring a mistrial, this is exactly what Dalzell felt happened to Lisa Lambert.• Had that fact been mentioned, the prosecutor could have demanded a mistrial.• The judge has dismissed at least a half-dozen defense requests for a mistrial since jury selection began last September.• But it is virtually unthinkable that it could end in an acquittal, still less a mistrial.• A mistrial was declared in the case.declared a mistrial• Judge Garcia was forced to declare a mistrial.• Since the jury could not make a decision, Judge Garcia was forced to declare a mistrial.• Barnhill saw no course but to declare a mistrial.• Yes, the judge said in declaring a mistrial, this is exactly what Dalzell felt happened to Lisa Lambert. 