Oath: A religious or solemn affirmation to tell the truth or to take a certain action. See the complete Legal Definition of Oath

Obiter Dictum: Latin: an observation by a judge on a matter not specifically before the court or not necessary in determining the issue before the court. See the complete Legal Definition of Obiter Dictum

Obligee: The person who is to receive the benefit of someone else's obligation. See the complete Legal Definition of Obligee

Obligor: A person who is contractually or legally, committed or obliged, to providing something to another person (the obligee). See the complete Legal Definition of Obligor

Obscenity: A publication which is illegal because it is morally corruptive. See the complete Legal Definition of Obscenity

Obstructing Justice: An act which tends to impede or thwart the administration of justice. See the complete Legal Definition of Obstructing Justice

Offense: A crime; any act which contravenes the criminal law of the state in which it occurs. Spelled offence in Commonwealth countries. See the complete Legal Definition of Offense

Offer: A explicit proposal to contract which, if accepted, completes the contract and binds both the person that made the offer and the person accepting the offer to the terms of the contract. See the complete Legal Definition of Offer

Ombudsman: A person whose occupation consists of investigating customer complaints against his or her employer. Many governments have ombudsmen who will investigate citizen complaints against government services. See the complete Legal Definition of Ombudsman

Omnibus Bill: A draft law before a legislature which contains more than one substantive matter, or several minor matters which have been combined into one bill, ostensibly for the sake of convenience. See the complete Legal Definition of Omnibus Bill

Onus: Latin: the burden. See the complete Legal Definition of Onus

Open-Ended Agreement: An agreement or contract which does not have an ending date but which will continue for as long as certain conditions, identified in the agreement, exist. See the complete Legal Definition of Open-Ended Agreement

Order: A formal written direction given by a member of the judiciary; a court decision without reasons. See the complete Legal Definition of Order

Ordinance: An executive decision of a government which has not been subjected to a legislative assembly (contrary to a statute). See the complete Legal Definition of Ordinance

Orphan: A person who has lost one or both of his or her natural parents. See the complete Legal Definition of Orphan

Out-of-Court Settlement: An agreement between two litigants to settle a matter privately before the Court has rendered its decision. See the complete Legal Definition of Out-of-Court Settlement

Occupational Rent: A matrimonial or joint tenant property compensatory claim based on an allegation that one spouse or joint tenant ought to be debited the value of her or his exclusive occupation of the family or jointly-held home. See the complete Legal Definition of Occupational Rent

Oligarchy: A form of government in which a few persons rule and govern by assuming all legislative and administrative authority. See the complete Legal Definition of Oligarchy

Occupiers' Liability: Liability of a person who controls land or building(s) in regards to damages caused to others who enter thereon. See the complete Legal Definition of Occupiers' Liability

Opening Statement: A lawyer or litigant's initial remarks at trial, to the finder of fact, either a judge or jury, setting out their road-map or case theory. See the complete Legal Definition of Opening Statement

Oversman: The Scottish law term for umpire. See the complete Legal Definition of Oversman

Obligations: A legal requirement established by law, contract or as a result of unlawful harm caused to the person or property of another. See the complete Legal Definition of Obligations

Officially Induced Error: A mistake of law caused by reliance upon erroneous legal advice obtained from an appropriate official. See the complete Legal Definition of Officially Induced Error

Order of the Coif: The ancient order of barristers in England. See the complete Legal Definition of Order of the Coif

Officer: A management-level employee of a corporation entrusted with discretion in the exercise of some portion of corporate powers. See the complete Legal Definition of Officer

Open Justice: A principle of the common law that proceedings ought to be open to the public, including the contents of court files and public viewing of trials. See the complete Legal Definition of Open Justice

Occupational Therapy: The employment and function assessment and treatment of post-injury, illness or disability. See the complete Legal Definition of Occupational Therapy