Expert Witness (noun) – A witness providing expert narrative or analysis. An expert assists the finder of fact in understanding the meaning or significance of evidence otherwise before the court. An expert may give an opinion on any relevant matter, although the expert’s opinion is never conclusive, and expert evidence is not to invade the province of the jury as the final arbiter of questions of fact in a jury trial.

 

Example – A DNA analyst might be called to testify during a criminal trial to confirm the test results of the DNA testing he or she might have completed.

Also see victim, prosecutor, and defendant.