Wyoming U.S. Legal System Terminology and Definitions
Legal terminology in the Wyoming and U.S. court systems carries precise meanings that differ substantially from ordinary English usage — and in some cases, differ from the same term's meaning in other states or federal venues. This page provides reference definitions for key terms used across Wyoming's trial courts, appellate courts, and federal courts operating within the state, drawing from Wyoming statutes, the Wyoming Rules of Civil and Criminal Procedure, and federal sources. Understanding these definitions supports accurate interpretation of court documents, statutes, and procedural rules. For a structural overview of how courts and legal processes relate, see How the Wyoming U.S. Legal System Works.
Scope and Coverage
This page covers terminology as it applies within Wyoming state courts and federal courts sitting in Wyoming, including the U.S. District Court for the District of Wyoming and the Tenth Circuit Court of Appeals. Definitions derived from Wyoming statutes, the Wyoming Rules of Civil Procedure (W.R.C.P.), and Wyoming Rules of Criminal Procedure (W.R.Cr.P.) govern state proceedings. Federal procedural definitions — drawn from the Federal Rules of Civil Procedure (FRCP) and Federal Rules of Criminal Procedure (FRCrP) — apply in federal venues.
This page does not cover: tribal court terminology under Wind River tribal codes (a distinct sovereign system addressed in Wyoming Tribal Courts and Sovereignty); administrative agency definitions specific to individual Wyoming agencies; or the specialized vocabulary of Wyoming's municipal courts. Terms related to sentencing ranges are addressed separately at Wyoming Sentencing Guidelines and Criminal Penalties. The regulatory context for Wyoming's legal system addresses agency-specific definitional frameworks.
How Terms Are Defined in Statute or Code
Wyoming statutory definitions carry binding legal force. When the Wyoming Legislature defines a term within a title or chapter of the Wyoming Statutes (W.S.), that definition governs interpretation across that title unless a specific provision states otherwise. For example, W.S. § 1-1-106 establishes computation-of-time rules that affect how deadlines are read throughout civil practice.
The principal sources for procedural terminology in Wyoming are:
- Wyoming Rules of Civil Procedure (W.R.C.P.) — Adopted and maintained by the Wyoming Supreme Court under its constitutional rulemaking authority; governs pleadings, discovery, motions, and judgments in civil cases.
- Wyoming Rules of Criminal Procedure (W.R.Cr.P.) — Governs arraignment, discovery, plea, trial, and sentencing procedures in criminal cases.
- Wyoming Rules of Evidence (W.R.E.) — Defines admissibility standards, witness competency, hearsay exceptions, and privilege for both civil and criminal proceedings.
- Wyoming Statutes (W.S.) — Title-specific definition sections (typically §X-1-101 or §X-1-102 in each title) establish legislative meaning for terms used within that regulatory scheme.
- Federal Rules — FRCP, FRCrP, and Federal Rules of Evidence apply in the U.S. District Court for the District of Wyoming, sometimes producing different definitions for identical terms.
The Wyoming Supreme Court's published opinions further interpret statutory language; under the doctrine of stare decisis, those interpretations bind lower Wyoming courts. When a Wyoming statutory definition conflicts with a federal definition, the applicable forum's rules control.
Terms with Jurisdiction-Specific Meanings
Certain terms have standard English or nationwide legal meanings that shift in the Wyoming context:
"Circuit Court" — In Wyoming, circuit courts are trial courts of limited jurisdiction handling misdemeanors, civil cases under $50,000, small claims, and preliminary felony hearings. This differs from federal usage, where "circuit court" refers to intermediate appellate courts (e.g., the Tenth Circuit). Wyoming eliminated its justice of the peace system and reorganized into the current circuit court structure through legislation effective in 2003, as documented by the Wyoming Judicial Branch.
"District Court" — Wyoming district courts are the state's courts of general jurisdiction, handling felony cases, civil cases exceeding circuit court limits, and most family law matters. The term also designates the U.S. District Court for the District of Wyoming — a federal trial court — creating a parallel usage that requires context to disambiguate. For more on this distinction, see Wyoming District Courts: Jurisdiction and Federal Courts in Wyoming.
"Petitioner" vs. "Plaintiff" — Wyoming uses "petitioner" in family law, probate, and certain administrative proceedings where no adversarial complaint is filed. The term "plaintiff" applies in civil tort, contract, and other adversarial actions. In criminal cases, the state itself is designated as the prosecuting party (e.g., State of Wyoming v. [Defendant]), not a plaintiff.
"Probable Cause" — For arrest purposes, Wyoming courts follow the Fourth Amendment federal standard articulated in Illinois v. Gates, 462 U.S. 213 (1983). Wyoming's constitution (Art. 1, § 4) provides parallel search-and-seizure protections; Wyoming courts may interpret the state provision more broadly but have generally tracked federal doctrine.
Contested or Context-Dependent Definitions
Some terms produce definitional disputes because their meaning varies by proceeding type, statutory scheme, or factual context.
"Jurisdiction" — This term encompasses at least 3 distinct legal concepts that courts treat differently: (a) subject matter jurisdiction, meaning the court's legal authority to hear a category of case; (b) personal jurisdiction, meaning the court's authority over a specific party; and (c) territorial jurisdiction, meaning geographic limits on enforcement. A Wyoming circuit court, for example, has subject matter jurisdiction over misdemeanors but lacks subject matter jurisdiction over felonies — even if the parties appear voluntarily.
"Notice" — Statutory notice requirements vary by proceeding. Notice sufficient for a small claims summons (W.S. § 1-21-203) differs from notice required for a felony arraignment, a probate publication (W.S. § 2-7-206), or an administrative hearing under the Wyoming Administrative Procedure Act (W.S. § 16-3-107). Assuming one standard applies across all contexts is a common error.
"Default" — In civil procedure, a "default" occurs when a party fails to plead or defend; a "default judgment" requires a separate court order and is governed by W.R.C.P. Rule 55. In contract law, "default" may mean failure to perform a contractual obligation. The procedural and substantive meanings are distinct and not interchangeable.
"Appeal" vs. "Review" — An appeal transfers jurisdiction from a lower to a higher court based on the trial record. Administrative "review" under the Wyoming Administrative Procedure Act (W.S. § 16-3-114) examines an agency's decision but may apply a deferential standard rather than the de novo review available in some direct appeals. This distinction is elaborated in the process framework for Wyoming's legal system.
Core Terms
The following terms appear across Wyoming civil, criminal, and appellate practice. Definitions reflect Wyoming statutory language, court rules, and applicable federal sources where noted.
Arraignment — A proceeding at which a criminal defendant is formally informed of charges and enters a plea of guilty, not guilty, or nolo contendere. Governed by W.R.Cr.P. Rule 10.
Burden of Proof — The obligation to produce sufficient evidence to establish a claim or defense. Wyoming recognizes 3 primary standards: (1) preponderance of the evidence (more likely than not — the civil standard); (2) clear and convincing evidence (used in certain civil matters including termination of parental rights under W.S. § 14-2-309); and (3) proof beyond a reasonable doubt (criminal standard, constitutionally required under In re Winship, 397 U.S. 358 (1970)).
Cause of Action — A legally recognized set of facts that entitles a party to seek judicial relief. Wyoming courts require that a cause of action be recognized either by Wyoming statute or by Wyoming common law; federal causes of action (e.g., under 42 U.S.C. § 1983) are litigated in either federal court or Wyoming district court depending on concurrent jurisdiction rules.
Complaint — The initial pleading in a civil action, required under W.R.C.P. Rule 8(a) to contain a short and plain statement of the claim and a demand for relief. In criminal proceedings, the equivalent document is a criminal "complaint" or "information" (for misdemeanors) or an "indictment" returned by a grand jury (for felonies), governed by W.R.Cr.P. Rules 3 and 7.
Continuance — A postponement of a scheduled court proceeding to a later date, granted by the court on motion. Wyoming courts evaluate continuance requests against speedy trial requirements (W.R.Cr.P. Rule 48 in criminal cases; the Wyoming Supreme Court's case management standards in civil cases).
Discovery — The pretrial process by which parties obtain evidence from each other and third parties. Under W.R.C.P. Rules 26–37, Wyoming civil litigants may use interrogatories, depositions, requests for production, and requests for admission. The scope of discovery in Wyoming state court differs in certain respects from FRCP scope language, particularly regarding proportionality.
Felony / Misdemeanor — Wyoming classifies crimes as felonies (punishable by imprisonment in a state penitentiary) or misdemeanors (punishable by imprisonment in a county jail not exceeding 1 year). Felony classes (A through E under W.S. § 6-10-101) carry defined maximum prison terms; misdemeanors are classified as high misdemeanors or simple misdemeanors.
Guardian ad Litem — A person appointed by a court to represent the interests of a minor or incapacitated person in a specific proceeding. In Wyoming, appointment is governed