n. A trial that is invalid because of an error in procedure
the GNU version of the Collaborative International Dictionary of English
n. A false or erroneous trial; a trial which has no result; a trial which comes to no conclusion, such as a criminal trial which does not produce a unanimous verdict of the jurors.
The Century Dictionary and Cyclopedia
n. In law: A trial the result of which is vitiated by errors, as by disqualification in a juror or in the judge.
n. More loosely, an inconclusive trial; a trial that fails to issue in a decision, as where the jury cannot agree.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a trial that is invalid or inconclusive
Word Usage
"And her case â declared a mistrial is now scheduled for June 15."