Definition
A Latin term from Roman civil law meaning "to be clear," "to be evident," or "to be satisfactory." In legal usage, liquere describes the state of a matter being sufficiently plain or manifest to permit confident judgment. Its significance in historical legal sources arises almost entirely through its negative form: the phrase sibi non liquere ("it is not clear to me"), which a Roman judex (judge) could declare under oath when a case presented such doubt or obscurity that he could not in good conscience render a verdict. Upon making this declaration to the praetor, the judex was discharged from the case — effectively recused by reason of unresolvable uncertainty — and a replacement could be appointed.
Common Confusion
Liquere is sometimes loosely grouped with terms denoting judicial bias or conflict of interest, but the concept is distinct. Sibi non liquere was not a declaration of partiality or disqualification for cause in the modern sense. It was a sworn acknowledgment of epistemic insufficiency — the judge could not reach clarity on the facts or law — rather than a claim that he was unfit to decide for personal reasons. Researchers should not conflate this Roman mechanism with modern recusal doctrine, which rests on different foundations.
Why It Matters in Research
Liquere is an archaic civil law term with no surviving procedural counterpart in common law systems. Researchers encountering the term will do so almost exclusively in historical sources: Roman law treatises, civil law commentaries, or scholarly discussions of comparative judicial procedure.
Several research traps apply. First, the term appears almost always in its negative construction (sibi non liquere or non liquet), and dictionary entries that define liquere affirmatively may obscure this operational emphasis. The standalone positive form — liquere, meaning simply "it is clear" — has far less legal significance than its negation. Second, non liquet has enjoyed a longer afterlife than liquere itself, persisting into international law discourse as a description of the situation where a court finds no applicable rule to resolve a dispute. Researchers working in public international law will encounter non liquet as a live doctrinal term; researchers in domestic law will encounter it only historically or comparatively. These are related but not identical uses, and the Roman procedural meaning should not be imported wholesale into the international law context.
Third, the discharge mechanism described in historical dictionary sources reflects a feature of Roman iudicia privata — the private law adjudication system operating through lay judices appointed for individual cases — and has no structural parallel in common law courts. Readers should resist reading modern judicial disqualification principles back into the Roman institution.
Historical Dictionary Support
Black's first and second editions and Burrill's are in close agreement, all three reproducing essentially the same core definition and the same procedural illustration. The entries are compact and rely on a narrow set of authorities. Burrill cites both Calvin's Lexicon Juridicum and Aulus Gellius's Noctes Atticae (XIV.2) — the latter being the primary classical source for the sibi non liquere procedure and worth consulting directly for researchers needing textual grounding in the Roman practice. Black's editions cite only Calvin, omitting the Gellius reference.
None of the three dictionary entries addresses the longer doctrinal history of non liquet, its reception in civil law scholarship, or its twentieth-century reappearance in international law argumentation. For any research purpose beyond confirming the basic meaning, the dictionary entries are a starting point only.
Jurisdictional Note
Liquere and sibi non liquere belong to Roman and civil law history and have no operative procedural role in any common law jurisdiction. The related concept of non liquet retains some currency in international law and comparative jurisprudence but is not a recognized procedural device in domestic American or English courts.