NATURAL LAW - The Law Mind Legal Dictionary

NATURAL LAWAuthored

The Law Mind • 1403 words

Definition

Natural law is the body of universal moral and legal principles held to be discoverable through human reason, independent of any enacted statute, sovereign command, or particular legal system. It posits that certain rights and obligations exist not because a legislature created them but because they inhere in the nature of rational beings and the order of the universe itself.

The concept operates on two distinct levels in legal scholarship and practice:

1. Philosophical-jurisprudential meaning. Natural law as a theory of law's foundations: the claim that law derives its legitimacy, or its very identity as law, from conformity with higher moral principles accessible to reason. On this view, an unjust positive enactment may fail to qualify as genuine law at all — the core thesis that distinguishes natural law theory from legal positivism.

2. Operative legal meaning. Natural law as an appeal to pre-political rights or trans-positive norms within legal argument — invoked in constitutional adjudication, common law development, and international law to fill gaps where enacted law is silent or where its application would produce results deemed contrary to fundamental justice.

The Roman juristic formulation, jus naturale or jus naturae, treated natural law as one of three overlapping categories alongside jus civile (the law of a particular community) and jus gentium (the law common to all peoples). This tripartite structure shaped centuries of Western legal thought and is directly reflected in the historical dictionaries.

Common Language

Modern common usage (Wiktionary): "The set of universal legal or moral principles said to be discernible from nature by reason alone; one of these principles. A theory describing or positing such principles. A law relating to natural phenomena."

Historical common usage (Webster's 1913): Webster's treated natural law primarily in the physical sciences sense — the regular, observable laws governing physical nature (gravity, thermodynamics, biology) — alongside its moral-philosophical sense.

The critical gap: in ordinary modern English, "natural law" is as likely to refer to a physical or biological regularity (the law of gravity, the law of natural selection) as to a moral principle. In legal contexts, the term is exclusively a jurisprudential and philosophical concept — it has nothing to do with physical science. Researchers encountering "natural law" in legal sources should not import the scientific meaning. Conversely, the moral-philosophical sense has largely receded from common speech while remaining central to legal theory.

Common Confusion

Natural law is frequently conflated with three related but distinct concepts:

Natural rights: Natural law is the framework of principles; natural rights are the specific entitlements said to flow from it. A natural law theorist may argue that natural law generates natural rights, but the two terms are not interchangeable. Declarations of rights in constitutional documents often reflect natural rights theory without invoking natural law by name.

Law of nature: In older legal texts — including Burrill and Bouvier — "natural law" and "law of nature" are used nearly interchangeably and cross-referenced to each other. In more precise modern usage, "law of nature" sometimes refers narrowly to universal physical regularities, while "natural law" retains its moral-jurisprudential sense. Historical sources do not consistently honor this distinction.

Jus gentium: Roman and early modern sources sometimes slide between natural law and the law of nations, treating jus gentium as the practical expression of jus naturale. They are analytically distinct: jus naturale is the universal moral baseline; jus gentium is the body of rules actually observed by all peoples, which may or may not track it perfectly.

Why It Matters in Research

Researchers working in the Law Mind corpus will encounter natural law arguments across an unusually wide range of legal fields, and the term's meaning shifts substantially depending on era and context.

Constitutional research: Natural law arguments are embedded in the founding-era debates over the Constitution and Bill of Rights and resurface in Fourteenth Amendment due process and substantive due process cases. When courts invoke "fundamental rights" or "ordered liberty," they are often deploying natural law reasoning without using the term. Researchers should not limit searches to the phrase itself.

Common law development: Pre-20th-century common law judges frequently appealed to natural law or "the law of nature" to justify decisions in areas where enacted law was absent — particularly in equity, contract, and property. These appeals appear in both the rationale and the authority sections of opinions and should be read as jurisprudential claims, not decorative rhetoric.

International law: The classical law of nations (Grotius, Vattel, Pufendorf) was explicitly grounded in natural law theory. Early American international law doctrine, including prize court decisions, drew heavily on this tradition. Corpus users researching 18th- and early 19th-century international law materials will find natural law functioning as operative legal authority, not merely background philosophy.

Terminological drift: The Roman tripartite framework (jus naturale / jus gentium / jus civile) appears in Latin throughout the historical dictionaries and in translated form in Blackstone and his American successors. Researchers must track which category a source is invoking, since they carry different implications for universality and enforceability.

Absence in modern doctrine: Natural law largely retreated from explicit judicial use in the 20th century under the influence of legal positivism and the rise of statutory interpretation. Its arguments persist in constitutional adjudication — particularly in debates over unenumerated rights — but often under different labels. Researchers should look for functional equivalents (higher law, fundamental law, inherent rights) rather than the phrase alone in modern case research.

Historical Dictionary Support

The historical dictionaries in the Law Mind corpus reflect a consistent core definition but reveal significant differences in depth and orientation.

Black's (1st Ed.) and Burrill both quote Taylor's Civil Law for the formula "the rule and dictate of right reason, showing the moral deformity or moral necessity there is in any act, according to its suitableness or unsuitableness to a reasonable nature." This formulation is Scholastic in origin, tracing through Aquinas to Cicero, and locates natural law in rational faculty rather than divine command alone. Both sources then situate the term in Roman jurisprudence, noting its use by the jurists of the Antonine age as "a system of rules and principles" independent of any positive enactment.

Black's 2nd Ed. adds a practical gloss: the entry uses "natural" in opposition to "legal," noting that natural law denotes what "proceed[s] from or [is] determined by physical causes or conditions" rather than positive enactments, and what is "attributable to the nature of man rather than to the commands of law." This framing is more pragmatically useful for 19th-century common lawyers but somewhat flattens the philosophical precision of the earlier entry.

Bouvier and Rapalje & Lawrence both cross-reference rather than define, directing readers to "Law of Nature" — a methodologically telling choice that confirms the terms were treated as functional synonyms at the time. Rapalje adds the derivative concept of "natural liberty" (the power of acting as one thinks fit, unrestrained except by the law of nature, from Blackstone), which is useful for researchers encountering that phrase in contemporaneous sources.

What the historical dictionaries collectively miss: they do not address the jurisprudential controversy between natural law and legal positivism that was already developing in 19th-century English thought (Austin's command theory) and became dominant in 20th-century jurisprudence. They also do not distinguish the term's different valences across constitutional, international, and common law contexts. Researchers relying solely on these sources will have the classical definition but will lack the interpretive tools to understand how natural law arguments function — or are contested — in later legal materials.

Jurisdictional Note

Natural law is a jurisprudential concept rather than a doctrine of any single jurisdiction, but its practical influence varies. American constitutional jurisprudence has been more openly receptive to natural law-inflected reasoning — particularly in substantive due process — than English courts, which have generally followed positivist traditions more strictly. In international law contexts, natural law arguments retain formal relevance through the law of nations tradition.

Encyclopedia Cross-Reference

The Law Mind Contracts & Commercial Law Encyclopedia: Contracts — Definition, Nature, and Sources of Contract Law (contracts_1). Natural law theory has historically informed the foundational questions of what makes a contractual obligation binding and whence contract law derives its authority.

NATURAL LAWmain

Black's Law Dictionary • 1891

The rule and dictate. of right reason, showing the moral deformity or moral necessity there is in any act, ac- cording to its suitableness or unsuitableness to a reasonable nature. Tayl. Civil Law, 99. This expression, "natural law," or jus naturale, was largely used in the philosoph- ical speculations of the Roman jurists of the Antonine age, and was intended to denote a system of rules and principles for the guid- ance of human conduct which, independent- ly of enacted law or of the systems peculiar to any one people, might be discovered by the rational intelligence of man, and would be found to grow out of and conform to his nature, meaning by that word his whole mental, moral, and physical constitution. The point of departure for this conception was the Stoic doctrine of a life ordered "ac- cording to nature," which in its turn rested upon the purely supposititious existence, in primitive times, of a "state of nature;" that is, a condition of society in which men uni- versally were governed solely by a rational and consistent obedience to the needs, im- pulses, and promptings of their true nature, such nature being as yet undefaced by dis- honesty, falsehood, or indulgence of the baser passions. See Maine, Anc. Law, 50, et seq.

NATURAL LAWmain

Black's Law Dictionary (2nd Ed.) • 1910

position to the term “legal;”’ and then it means proceeding from or determined - by physfcal causes or conditions, as distinguished from positive enactments of law, or attributable to the nature of man rather than to the commands of law, or based upon moral rather than legal considerations or sanctions. —Natural affection. Such as naturally subsists between near relatives, as a father and child, brother and sister, husband and wife. This is regarded in law as a good consideration.—Natural-born subject. In English law. One born within the dominions, or rather within the allegiance, of the king of England.— Natural fool. A person born without understanding; a born fool or idiot. Sometimes called, in the old books, a “natural.” In re An derson, 132 N. C. 243, 43 S. E. 649.—Natural life. The period between birth and natural death, as distinguished from civil death, (g. v.) As to natural “Allegiance,” “Boundary,” “Channel,” “Child,” “Day,” “Death,” ‘“‘Domicile,” “Equity,” “Fruits,” “Guardian,” “Heir,” “Infancy,” “Liberty,” “Obligation,” “Person,” “Possession,” “Presumption,” “Rights,” “Succession,” ‘“Water-course,” and “Year,’”’ see those titles. A rule of conduct arising out of the natural relations of human beings, established by the Creator, dnd existing prior to any positive precept. Webster. The foundation of this law is placed by the best writers in the will of God, discovered by right reason, and aided by divine revelation; and its principles, when applicable, apply with equal obligation to individuals and to nations. 1 Kent, Comm. 2, note;. Id 4, note. See Jus NATURALE. The rule and dictate of right reason, showing the moral deformity or moral necessity there is in any act, according to its suitablehess or unsuitableness to a reasonable nature. Tayl. Civil Law, 99. This expression, “natural law,” or jus neturale, was largely used in the philosophical speculations of the Roman jurists of the -Antonine age, and was intended to denote a system of ‘rules and principles for the guidance of human conduct which, independently of enacted law or of the = eldest conarced to any one people, might be discove by the rational intelligence of man, and would be_found to grow out of and conform to his nature, meaning by that word his whole mental, moral, and physical constitution. The point of departure for this conception was the Stoic doctrine of a life ordered “according to nature,’ which in its turn rested upon the purely supposititious existence, in rimitive times, of a “state of nature;” that is, a condition of society in which men uni-: versally were governed solely by a rational and consistent obedience to the needs, impulses, and prompe aes of their true nature, such nature ing as yet undefaced by dishonesty, falsehood, or indulgence of the baser passions... See Maine, Anc. Law, 50, et seq. We understand all laws to be either human or divine, according as they have man or God for their author; and divine laws are of two kinds, that is to say: (1) Natural laws; (*) posture or revealed laws. A natural law is dehnued by Burlamagui to be ‘“‘a rule which so necessarily agrees with the nature and state of mar that,- without observing its maxims, the peace and happiness of society can never be preserved.” And he says that. these are called “natural —_ oy aac e

NATURAL LAWmain

Rapalje & Lawrence • 1883

-See LAW, & 2, and note. NATURAL LIBERTY.-The power of acting as one thinks fit, unrestrained by any other power than the law of nature. 1 Bl. Com. 125.

natural lawnoun

Wiktionary (English) • 2026

Wiktionary contributors • CC BY-SA 4.0 • via Kaikki
Extracted and formatted for display by Law Mind. Source link opens the current Wiktionary page and its contributor history; it is not a frozen copy of this extract.

The set of universal legal or moral principles said to be discernible from nature by reason alone; one of these principles. | A theory describing or positing such principles. | A law relating to natural phenomena.

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