Criminal Law. The fighting of two persons, one against the other, at an appointed time and place, upon a precedent quarrel. It differs from an affray; while an affray occurs on a sudden quarrel, duelling is always the result of design. Related entries Fratricide Heresy Drug Paraphernalia Regina v. Dudley & Stephens Civil Disobedience PDR Network, LLC v. Carlton & Harris Chiropractic Obstruction of Justice Principal in the Second Degree Principal in the First Degree Accessory