The legal definition of a “jury” is a fundamental concept within the legal system, particularly in common law jurisdictions like the United States and the United Kingdom. A jury is a group of individuals, typically selected from the community, who are responsible for hearing evidence and rendering a verdict in legal proceedings, primarily in criminal and civil trials. The jury plays a critical role in upholding the principles of justice, fairness, and impartiality in the legal process.

A jury is usually composed of 12 members in criminal cases, though the number may vary in different jurisdictions and for civil cases. It is essential to note that the composition and rules surrounding juries can differ significantly from one legal system to another. However, the core principles remain relatively consistent.


A fundamental requirement of a jury is that its members must be impartial and free from any bias or prejudice. This is achieved through a process of jury selection, where potential jurors are questioned by the legal representatives of both parties to ensure they can render an unbiased verdict.

Role in Fact-Finding

The primary function of a jury is to act as a fact-finder. Jurors are responsible for hearing evidence presented by both parties in a case and determining the facts of the case based on that evidence. They are not judges but rather laypeople who bring their collective judgment to bear on the case.

Legal Instructions

The judge presiding over a trial provides legal instructions to the jury, explaining the relevant laws and principles that should guide their decision-making. The jury’s duty is to apply the law to the facts of the case.


Once all evidence has been presented and closing arguments made, the jury retires to deliberate in private. During deliberation, jurors discuss the evidence, review their notes, and reach a consensus on the verdict. The decision reached must be unanimous in most criminal cases, while civil cases may sometimes allow for majority decisions.


The jury renders a verdict based on their deliberations. In a criminal trial, the verdict can be “guilty” or “not guilty,” signifying whether the defendant is convicted or acquitted. In a civil trial, the verdict might be for the plaintiff (in favor of the person bringing the lawsuit) or for the defendant (against the person bringing the lawsuit).

Protection of Rights

Juries are often seen as a safeguard against potential abuses of power by the government or other entities. They serve as a means of ensuring that individuals receive a fair and impartial trial by their peers, rather than being subject to decisions made solely by judges or legal authorities.

Jury Nullification

While not commonly discussed in courtrooms, there exists a concept known as “jury nullification.” This occurs when a jury, despite the evidence presented, decides to acquit a defendant. Jury nullification is based on the principle that jurors have the power to exercise their conscience and set aside the law when they believe it would lead to an unjust result.

Challenges to the Jury Selection Process

In the jury selection process, both the prosecution and the defense have the right to challenge potential jurors through peremptory challenges or challenges for cause. Peremptory challenges allow attorneys to remove potential jurors without stating a reason, while challenges for cause require showing a specific reason, such as a potential juror’s bias.

In summary, a jury is a cornerstone of the legal system, designed to ensure fairness and justice in the resolution of legal disputes. It consists of ordinary citizens who take on the significant responsibility of impartially considering the evidence and rendering a verdict in accordance with the law. The composition and specific rules governing juries can vary by jurisdiction and type of case, but their essential role remains consistent.

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