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Oath Written or oral pledge by a person to keep a promise or speak the truth.

Obiter Dictum Remark by a judge in a legal opinion that is irrelevant to the decision and does not establish precedent . Often used in the plural, dicta.

Objection In a trial, a reason stated on the record by an attorney that a matter or proceeding is illegal. Making objections in open court is important for purposes of making a record for appeal.

Occupational Disease An illness resulting from long-term employment in a particular type of work, such as those employees exposed to asbestos, who later develop cancer.

On a Person's Own Recognizance Release of a person from custody without the payment of any bail or posting of bond, upon the promise to return to court.

Opening Statement The initial statement made by attorneys for each side, outlining the facts each intends to establish during the trial.

Opinion Written statement by a judge or court of the decision in a case which describes the law applied to the facts of the case and the reasons for the decision.

Oral Argument An opportunity for lawyers to summarize their position before the court and also to answer the judges' questions.

Order Written direction or command made by a court or judge, and not included in a judgment. See also decree.

Ordinance Commonly, a regulation passed by a municipal legislative body.

Original jurisdiction The first court to which a legal dispute is referred.

Out-of-Court Settlement An agreement reached between a plaintiff and a defendant to resolve a lawsuit privately and without a judge's authorization or approval.

Overrule A judge's decision not to allow an objection. Also, a decision by a higher court finding that a lower court decision was in error.