An oath administered to a witness, usually before being sworn in chief, requiring him to speak the truth, or make true answers in reference to matters inquired of, to ascertain his competency to give evidence.
The preliminary examination made in court of witnesses or jurors to determine their interests in a matter.
A mini-hearing held during a trial on the admissibility of contested evidence. For example, a defendant may object to a plaintiff's witness. The court would suspend the trial, immediately preside over a hearing on the standing of the proposed witness, and then resume the trial with or without the witness, or with any restrictions placed on the testimony by the judge as a result of the voir dire ruling. In a jury trial, the jury would be excused during the voir dire.