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Legal Definitions - F. 3D

Simple Definition of F. 3D

F. 3D is an abbreviation for the Federal Reporter, Third Series. This legal citation refers to the collection of federal appellate court decisions published starting in 1993. It is a standard way to cite cases from the U.S. Courts of Appeals.

Definition of F. 3D

"F.3d" stands for Federal Reporter, Third Series. This is a standard abbreviation used in legal citations to refer to a specific collection of published decisions from the United States Courts of Appeals. These courts are federal appellate courts, meaning they review decisions made by lower federal trial courts. The "Third Series" specifically compiles these appellate court opinions starting from 1993 and continues to the present day. When you see "F.3d" in a legal document, it indicates that the referenced case can be found in this particular set of legal volumes, providing a precise way to locate and verify judicial precedent.

Here are some examples of how "F.3d" might be used:

  • Example 1: Citing Precedent in a Legal Brief

    A lawyer is preparing a legal brief for a client and needs to support their argument with a previous ruling from a federal appeals court. They might write: "The principle established in United States v. Smith, 345 F.3d 678 (9th Cir. 2004), clearly supports our position that..."

    Explanation: This example shows "F.3d" being used as part of a formal legal citation. "345 F.3d 678" tells anyone reading the brief exactly where to find the full text of the United States v. Smith decision: in volume 345 of the Federal Reporter, Third Series, starting on page 678. The "(9th Cir. 2004)" further specifies it was a decision from the Ninth Circuit Court of Appeals in 2004.

  • Example 2: Academic Research on Judicial Trends

    A political science researcher is studying how federal appellate courts have interpreted a particular environmental law over the past two decades. In their academic paper, they might discuss a key ruling, stating: "The landmark decision in Environmental Advocates v. EPA, 123 F.3d 456 (D.C. Cir. 1997), significantly altered the regulatory landscape..."

    Explanation: Here, "F.3d" helps the researcher precisely reference a specific federal appellate court case that is relevant to their study. It allows other academics and readers to easily locate the original court opinion in the Federal Reporter, Third Series, which is crucial for verifying the research and understanding the legal context of the environmental law's interpretation.

  • Example 3: A Judge Referencing Prior Rulings

    In a written opinion, a federal appellate judge is explaining their decision in a complex commercial dispute. To justify their reasoning, they might refer to a previous, similar case: "As we held in Corporate Solutions, Inc. v. Tech Innovations LLC, 789 F.3d 1011 (2nd Cir. 2015), the interpretation of contract clauses must consider the parties' intent at the time of agreement..."

    Explanation: This illustrates how judges themselves use "F.3d" to cite their own court's precedents or those of other federal appellate courts. By including "789 F.3d 1011," the judge provides a clear and authoritative reference to a prior ruling in the Federal Reporter, Third Series, demonstrating consistency with established legal principles and allowing others to review the foundational case.

Last updated: November 2025 · Part of LSD.Law's Legal Dictionary · Trusted by law students since 2018