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A dissenting opinion (or dissent) is an opinion in a legal case written by one or more judges expressing disagreement with the majority opinion of the court which gives rise to its judgment. When not necessarily referring to a legal decision, this can also be referred to as a minority report.
A dissenting opinion does not create binding precedent nor does it become a part of case law. However, they are cited from time to time as a persuasive authority when arguing that the court's holding should be limited or overturned. In some cases, a previous dissent is used to spur a change in the law, and a later case will write a majority opinion for the same rule of law formerly cited by the dissent.
The dissent may disagree with the majority for any number of reasons: a different interpretation of the case law, use of different principles, or a different interpretation of the facts. They are written at the same time as the majority opinion and are often used to dispute the reasoning behind the majority opinion.
A dissent in part is a dissenting opinion that disagrees selectively—specifically, with one part of the majority holding. In decisions that require holdings with multiple parts due to multiple legal claims or consolidated cases, judges may write an opinion "concurring in part and dissenting in part".
In some courts, such as the Supreme Court of the United States, the majority opinion may be broken down into numbered or lettered parts, which allows those judges "dissenting in part" to easily identify which parts they join with the majority, and which sections they do not.