Definition
Latin: "To hear and determine." A phrase describing the commission or authority granted to judges or commissioners empowering them both to receive evidence or argument and to render a final decision in a matter. It denotes a full adjudicative power — not merely the authority to investigate or report, but to conclude the proceeding with a binding determination.
The phrase appears most commonly in the context of commissions of oyer and terminer, the name of which derives from the same operative words in their Anglo-Norman form. A commission ad audiendum et terminandum authorized its recipients to sit as a court, hear the parties or evidence, and terminate the cause — that is, bring it to a legal end through judgment.
Common Confusion
This phrase is closely associated with — and easily confused with — the term OYER AND TERMINER, which is its Anglo-Norman equivalent. "Oyer" derives from the French ouïr (to hear) and "terminer" from terminer (to determine), making oyer and terminer a direct translation of ad audiendum et terminandum into Law French. Researchers encountering either phrase in historical records are likely looking at the same type of commission; the Latin form appears more often in formal writs and scholarly legal treatises, while the Anglo-Norman form dominates court records and commission titles. The two are functionally interchangeable but appear in different documentary registers.
Why It Matters in Research
The primary research value of this phrase lies in its role as a key to identifying the scope of judicial commissions in historical records. A commission that included ad audiendum et terminandum language was distinguished from more limited commissions — such as those granted only to inquire (ad inquirendum) or to deliver gaols without full hearing authority. When reading historical patent rolls, commission records, or assize documents, the presence or absence of this phrase signals whether the tribunal held plenary adjudicative power.
Researchers working in English legal history before the nineteenth century should treat this phrase as a marker of a specific procedural category. Its appearance in a writ or commission is not merely formulaic — it defines the legal competence of the body receiving it. Confusing a commission with this power for one without it can lead to misreading the procedural posture of a historical case.
The phrase also appears in scholarly and treatise literature discussing the theoretical foundations of judicial authority, where writers distinguished between jurisdictions that could merely hear and those that could both hear and finally determine. This distinction carries forward into later discussions of appellate versus trial jurisdiction, making the phrase a conceptual ancestor to modern notions of adjudicative finality.
Because the phrase is pure Latin legal terminology with no common English counterpart, it is unlikely to appear in non-legal sources. Researchers who encounter it outside formal legal records should treat that appearance as significant.
Historical Dictionary Support
Black's Law Dictionary (2nd Ed., Supplemental) defines the phrase tersely as "To hear and determine," citing Statute of Westminster references (2, cc. 29, 30). The entry is brief but accurate. Black's does not elaborate on the phrase's relationship to oyer and terminer commissions, nor does it address the procedural significance of the distinction between hearing-only and hearing-and-determining authority. For a term with this much doctrinal weight in English legal history, the single-line treatment is a known limitation of the source. Researchers relying solely on Black's will have the translation but not the context needed to use it effectively in historical source analysis.
No meaningful divergence exists among historical dictionaries on the core translation; the Latin is unambiguous. The scholarly gap lies not in definitional disagreement but in the absence of extended treatment explaining how this commission language functioned in practice.
Jurisdictional Note
This is a term of English legal history and has no active operational meaning in modern American or Commonwealth courts. Its relevance is primarily archival and historical. American courts inherited the oyer and terminer terminology through colonial legal practice, and some states retained oyer and terminer as a court name into the nineteenth century, but the Latin form ad audiendum et terminandum does not appear in modern American legal usage.