Definition
Latin: "to declare the law." The function of a court or judge in pronouncing what the law is and applying it to the facts before the tribunal. Jus dicere is the judicial act of finding, interpreting, and announcing an existing rule of law — as distinguished from creating or giving law. It describes the proper province of the judiciary: to say what the law is, not what it ought to be.
The phrase captures the foundational principle that judges do not legislate. When a court decides a case, it exercises jus dicere — it declares the legal rule that governs the dispute and applies it. The court does not, in theory, make the rule; that is the function of the legislature or sovereign.
---
Common Confusion
JUS DICERE vs. JUS DARE. These Latin phrases are paired opposites and are routinely confused or conflated in older legal writing. Jus dicere means to declare the law; jus dare means to give or make the law. The distinction tracks the separation of powers: courts exercise jus dicere; legislatures exercise jus dare. The confusion matters in historical research because writers sometimes use jus dicere loosely to mean the entire judicial function, which can obscure whether a source is discussing adjudication specifically or lawmaking authority more broadly. Rapalje & Lawrence flag this distinction explicitly. See also JUS DARE.
---
Why It Matters in Research
The phrase does most of its work in two overlapping contexts: separation of powers arguments and discussions of judicial role and legitimacy. Researchers encountering jus dicere in historical sources should be alert to context.
In older equity materials, the phrase often appears when a chancellor or equity judge is defending the limits of equitable discretion. Lord Henley's remark — quoted directly in Burrill — is the canonical instance: a judge asserting that his office is to declare the law, not to give it, and thereby resisting pressure to stretch equitable relief beyond recognized principles. This framing recurs in nineteenth-century equity treatises and judicial opinions when courts are asked to extend doctrine into new territory.
In constitutional and jurisprudential writing, jus dicere becomes a marker in debates over judicial lawmaking. Researchers tracing the development of common law theory, judicial restraint, or originalist argument will find the term deployed as a boundary marker — what courts may legitimately do versus what belongs to the legislature. The phrase therefore connects directly to natural law theory, common law constitutionalism, and the declaratory theory of law (the view that judges discover rather than create legal rules).
The term appears rarely in modern case law but resurfaces in academic legal history and jurisprudence. When it does appear in modern judicial opinions, it is almost always in the context of separation of powers or a judge self-consciously invoking classical limits on the judicial role. Searches in historical legal databases should use the Latin form; English translations will not reliably capture all instances.
Because the phrase is closely bound to the declaratory theory of law, researchers should also check companion sources on that theory when building a complete picture — particularly Blackstone's Commentaries and Austin's critique of the declaratory theory in the Province of Jurisprudence Determined.
---
Historical Dictionary Support
The four source dictionaries agree entirely on the core definition and share nearly identical language, all tracing to the same authorities: 2 Eden 29 and 3 P. Wms. 485. Black's (both editions) and Burrill define the phrase as "to declare the law; to say what the law is. The province of a court or judge." Rapalje & Lawrence is more compressed but consistent.
Burrill is the most instructive of the four because it preserves the actual quotation from Lord Henley: "My business in this and every other case, is jus dicere, non jus dare." That formulation — jus dicere, not jus dare — is the phrase in its natural habitat. It appears in a judicial opinion, used by a sitting equity judge as a deliberate statement of the limits of his own office. Burrill's decision to quote directly rather than paraphrase gives the entry historical texture that Black's loses by abstraction.
What the historical dictionaries do not address: the relationship between jus dicere and the declaratory theory of law, the tension between the phrase and legal realist critiques of judicial decision-making, or the phrase's role in constitutional argument. Those connections must be developed from primary sources and secondary jurisprudential literature. The dictionary entries treat jus dicere as a settled Latin term of art rather than a contested concept, which understates its theoretical freight.
---
Encyclopedia Cross-Reference
See Law Mind Encyclopedia: Separation of Powers; Declaratory Theory of Law; Judicial Function in Equity.
---