Definition
A commission, court, or clause of judicial authority empowering judges to hear and determine criminal cases. The phrase is Law French meaning "to hear and determine." Historically, oyer et terminer referred to a royal commission issued in England to judges authorizing them to hear and decide serious criminal matters — typically felonies and treasons — at assizes or special sessions. In American usage, the term was carried over to designate superior criminal courts, or specific terms of such courts, having jurisdiction over serious offenses.
Two distinct senses appear in legal sources:
1. Commission of Oyer et Terminer: A formal royal or gubernatorial commission directing named judges or commissioners to hear and determine specified criminal charges. The commission itself created or extended the court's authority.
2. Court of Oyer et Terminer: In several American states, a standing or periodic court — distinct from general common pleas or supreme courts — with jurisdiction over capital crimes and serious felonies. Some state constitutions or statutes established Courts of Oyer et Terminer as the primary forum for major criminal trials.
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Common Confusion
OYER ET TERMINER is frequently encountered alongside GAOL DELIVERY, a related but distinct commission. A commission of oyer et terminer authorized judges to hear and determine charges for specific classes of crime. A commission of gaol delivery authorized the clearance of the jail — the trial of all prisoners held there, regardless of offense. Historically the two commissions were often issued together and executed at the same assize, leading researchers to treat them as synonymous. They are not: oyer et terminer defined the subject-matter jurisdiction; gaol delivery defined the prisoner population. Conflating them misreads the scope of a court's authority in any given historical record.
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Why It Matters in Research
Researchers encounter this term across four centuries of Anglo-American legal records, and its meaning shifts depending on era and jurisdiction.
In English sources, oyer et terminer is primarily a commission rather than a standing court. Finding a reference to "a commission of oyer et terminer" in a 17th- or 18th-century English record tells you that special judicial authority was invoked — often because the ordinary assize structure was insufficient, or because political urgency demanded a specially constituted tribunal. The Salem witch trials of 1692 were conducted before a Court of Oyer and Terminer commissioned by the governor of Massachusetts Bay, a fact that illustrates how the commission form could be deployed in colonial contexts far removed from the English assize system.
In American state records, the term transitions from a commission concept to an institutional one. Several states — Pennsylvania being the most prominent — maintained Courts of Oyer and Terminer as regular parts of their judicial structure well into the 19th and even 20th centuries. Researchers working in Pennsylvania criminal records must understand that "Oyer and Terminer" designates a specific court with its own dockets, separate from the Court of Quarter Sessions or the Supreme Court. Conflating these courts will produce errors in tracing case records.
Dating matters: the term largely disappeared from American judicial organization during the 19th-century consolidation of court systems, replaced by superior courts, district courts, or circuit courts with general criminal jurisdiction. If a source refers to a "Court of Oyer and Terminer" without a date, the jurisdictional and institutional context is ambiguous until the era is pinned down.
The cry "Oyez" — still used by court officers to call courts to order — is etymologically related but functionally distinct. Burrill notes the variant "Oyes" and the transition to "Hear ye" in American courts. This surface similarity sometimes causes researchers to treat oyez and oyer et terminer as connected legal concepts; they share a root but operate in entirely different registers: one is a ceremonial call to attention, the other is a grant of adjudicatory authority.
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Historical Dictionary Support
Burrill's Law Dictionary provides the core translation — "to hear and determine" — and traces the phrase through Britton and the Articles upon the Charters, grounding the commission in foundational English legal instruments. Burrill also notes the related court cry "Oyes" (rendered "O yes!" in the source), distinguishing the procedural call from the jurisdictional commission — a distinction worth preserving, as later researchers have sometimes blurred it.
Burrill's entry is compact and does not address the American institutional development of the term — the transition from commission to standing court — which requires supplementation from American legal histories and state constitutional sources. The entry also does not treat the commission's relationship to gaol delivery, which is essential context for anyone working with English assize records. For that relationship, researchers should consult historical treatments of the English assize system directly.
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Jurisdictional Note
Pennsylvania maintained a Court of Oyer and Terminer as a distinct institution longer than most American states, and its records are extensive. In colonial-era jurisdictions generally, the commission form predominated; in 19th-century American states, the term increasingly designated a specific court tier. English usage never institutionalized the term in the same way — it remained a commission concept throughout.
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