All terms

Legal Terms: J

Federal & State Law Editorial TeamLast reviewed: April 2026

J.E.B. Challenge

criminal procedure

An extension of Batson barring peremptory strikes based on gender, established in J.E.B. v. Alabama ex rel. T.B.

Jencks Act

criminal procedure

A federal statute (18 U.S.C. 3500) requiring the government to produce prior statements of witnesses after they testify on direct examination, for use in cross-examination.

Joinder

civil procedure

The joining of parties or claims in a single lawsuit to promote judicial efficiency.

Joinder

civil procedure

The procedural mechanism for combining parties or claims in a single action, governed by Rules 18-20 for parties and claims and Rule 19 for required parties.

Joint and Several Liability

tort

A legal doctrine making each defendant independently liable for the full amount of damages, regardless of their individual share of fault.

Joint Defense Privilege

evidence

A doctrine permitting co-defendants and their counsel to share privileged information for a common defense without waiving the underlying privilege.

Joint Employer

employment

A legal doctrine in which two or more entities are considered to share control over an employee's terms and conditions of employment, making both liable for labor law compliance.

Joint Physical Custody

family law

An arrangement in which the child spends substantial time residing with each parent, often roughly equal but always more than mere visitation.

Joint Tenancy

property

A form of co-ownership of property where two or more persons hold equal shares with the right of survivorship.

Joint Tenancy with Right of Survivorship

estate planning

A form of co-ownership in which, upon the death of one joint tenant, that tenant's interest passes automatically to the surviving joint tenants outside of probate.

Joint Work

intellectual property

A work prepared by two or more authors with the intention that their contributions be merged into inseparable or interdependent parts of a unitary whole, with each author owning an equal undivided interest.

Journalist's Privilege

evidence

A qualified privilege, recognized in many jurisdictions, protecting reporters from compelled disclosure of confidential sources and unpublished information.

Judge

courts

A public official appointed or elected to preside over and decide cases in a court of law.

Judge Advocate

military

A military officer who is a licensed attorney serving as a legal adviser, prosecutor, or defense counsel within the military justice system.

Judgment

civil procedure

The final decision of a court resolving the dispute between the parties and determining their rights and obligations.

Judgment as Matter of Law

civil procedure

A motion under Rule 50(a) at trial that, considering the evidence, no reasonable jury could find for the nonmoving party on a particular issue.

Judgment of Acquittal

criminal procedure

A judicial finding of not guilty entered when the prosecution's evidence is insufficient as a matter of law to sustain a conviction.

Judicial Admission

contract law

An admission in court pleadings or testimony that a contract was made, which under UCC 2-201(3)(b) may satisfy the statute of frauds for the quantity admitted.

Judicial Estoppel

civil procedure

An equitable doctrine that prevents a party from asserting a position in litigation that contradicts a position successfully asserted in a prior proceeding.

Judicial Notice

evidence

A court's acceptance of a well-known fact without requiring formal proof, such as the date of a holiday or a scientific principle.

Related:evidencefact

Judicial Notice

evidence

A court's acceptance, without formal proof, of facts that are not subject to reasonable dispute because they are generally known or readily verifiable.

Judicial Review

constitutional

The power of courts to examine legislative and executive actions and determine whether they are constitutional.

Jurisdiction

courts

The authority of a court to hear and decide a case. Includes subject-matter jurisdiction (types of cases) and personal jurisdiction (authority over parties).

Jurisdiction Conflict Convention

family law

A treaty or interstate compact resolving competing claims of authority between courts over the same family-law matter, ensuring that only one forum proceeds and others defer.

Jurisprudence

general

The theory and philosophy of law, or the body of legal knowledge and principles.

Jury

courts

A group of citizens selected to hear evidence in a trial and render a verdict based on the facts presented.

Jury Duty

civil procedure

The civic obligation to serve as a juror in a court of law when summoned. Federal law (28 U.S.C. § 1866) and state statutes prohibit employers from penalizing employees for jury service. Exemptions vary by jurisdiction but may include age, prior service, undue hardship, and certain occupations.

Jury Instructions

civil procedure

Directions given by a judge to a jury explaining the applicable law and how to apply it to the facts of the case.

Related:juryverdict

Jury Instructions

criminal procedure

The judge's directions to the jury explaining the applicable law, elements of the offense, and standards for evaluating evidence.

Jus Sanguinis

immigration

Latin for 'right of blood,' the principle under which citizenship is transmitted by descent from a citizen parent regardless of place of birth.

Jus Soli

immigration

Latin for 'right of soil,' the principle under which citizenship is granted to virtually anyone born in U.S. territory, codified in the Fourteenth Amendment.

Just Compensation

property

The payment the government must make to a property owner when taking private property through eminent domain, typically fair market value.

Just Compensation

real estate

The fair market value that the government must pay a property owner when taking private property through eminent domain.

Juvenile

criminal

A person who has not yet reached the age of legal majority (typically 18). Juvenile proceedings are generally separate from adult criminal proceedings.

This is legal information, not legal advice. Laws vary by jurisdiction and change frequently. Always verify current law with official sources and consult a licensed attorney in your jurisdiction for advice on your specific situation.