Definition
**Legitimacy** is the legal status of a person — almost always a child — as having been born within the bounds of a valid marriage, or otherwise recognized by law as the lawful offspring of both parents. A **legitimate** child is one whose parents were married to each other at the time of birth, or in some legal systems, who has been subsequently legitimated by the marriage of the parents or by formal legal act.
The term carries two related but distinct applications:
1. **Status legitimacy (family law):** The condition of a child born in lawful wedlock, or brought within it by subsequent marriage or judicial declaration. Legitimacy in this sense determined — historically with great force — a child's right to inherit from the father, to bear the father's name, and to claim maintenance and support.
2. **Constitutional and statutory legitimacy:** In modern American law, "legitimate" and "illegitimate" became terms of constitutional significance as courts examined whether legal distinctions drawn on the basis of a child's birth status violated equal protection guarantees. The U.S. Supreme Court substantially eroded the legal consequences of illegitimacy across the latter half of the twentieth century, though the status has not been entirely abolished as a legal category.
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Common Language
**Modern common usage (Wiktionary):** "Legitimate" in everyday English means lawful, genuine, or justifiable — as in a legitimate complaint, a legitimate business, or a legitimate heir. "Legitimacy" denotes the quality of being lawful, genuine, or socially accepted.
**Historical common usage (Webster's 1913):** Webster defines "legitimate" as "Accordant with law or with established legal forms and requirements; lawful; as, legitimate government; legitimate rights. Born in wedlock; born of parents legally married, and therefore entitled to full civil rights. Logically correct; as, a legitimate argument."
**Editorial note:** The common and legal meanings overlap substantially, but researchers must not let the broad ordinary sense — "lawful" or "genuine" — obscure the highly technical family-law meaning. In legal sources through most of the nineteenth and early twentieth centuries, "legitimate" almost always means specifically *born in lawful wedlock*, not merely *lawful in a general sense*. A document describing someone as "a legitimate heir" is almost certainly making a statement about birth status and marriage, not about the propriety of the inheritance claim.
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Common Confusion
**Legitimacy vs. Legitimation:** These are related but distinct. Legitimacy describes a status that exists from birth (or is presumed from birth within marriage). Legitimation is a legal process — typically the subsequent marriage of the parents, a formal acknowledgment, or a court decree — by which a child born outside marriage acquires the legal status of a legitimate child. A legitimated child was not legitimate at birth but became so through a subsequent legal act. Historical sources use both terms, sometimes interchangeably, but the distinction matters when tracing inheritance rights and succession.
**Legitimacy vs. Paternity:** Legitimacy is a legal status; paternity is a biological or legal fact of fatherhood. A child may have paternity legally established without being "legitimate" in the traditional sense, and vice versa (a child born in marriage is presumed legitimate regardless of actual biological paternity). Modern statutes have largely shifted from legitimacy frameworks to paternity and parentage frameworks, but older sources turn heavily on the legitimacy concept.
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Core Elements
For a child to be legitimate under the traditional common-law rule:
1. **Valid marriage:** The parents were united in a legally valid marriage at the time of the child's conception or birth.
2. **Presumption of paternity:** The husband of the mother was presumed to be the father. This presumption was historically very strong — in many jurisdictions, nearly irrebuttable — and a husband could not generally bastardize his own child by denying access.
3. **Birth within the marriage:** Birth during the marriage, or within a recognized period following its dissolution, triggered the presumption of legitimacy.
Where legitimation (rather than birth legitimacy) is the question, the applicable elements vary by jurisdiction and statute: most commonly, subsequent marriage of the parents combined with acknowledgment by the father, or formal court decree.
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Recognized Forms
/SUBTYPES
- **Presumptive legitimacy:** The common-law presumption that a child born to a married woman is the legitimate child of her husband. One of the strongest presumptions in law historically.
- **Legitimation by subsequent marriage:** A civil-law derived doctrine, adopted in many American states by statute, under which the later marriage of the parents confers legitimate status on a child born before the marriage.
- **Legitimation by acknowledgment:** Recognized in some jurisdictions where a father's formal acknowledgment of a child born outside marriage carries legal effect equivalent to legitimation.
- **Judicial legitimation:** A court decree establishing legitimate status, used where statutory legitimation procedures are available.
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Why It Matters in Research
**The doctrinal landscape shifted dramatically across the twentieth century.** Researchers working with American sources before approximately 1968 will encounter a regime in which illegitimacy carried sweeping legal disabilities — exclusion from intestate inheritance from the father, no right of support, limited capacity to sue for wrongful death. Sources after that period reflect a constitutional dismantling of these disabilities. Cases and statutes from the 1970s and 1980s are a transition zone where the old vocabulary persists but the legal consequences have been partially or substantially modified.
**The presumption of legitimacy is a major research trap in historical sources.** Because the presumption was so powerful, early treatises and cases often discuss legitimacy without acknowledging that biological reality might differ. Modern disputes over inheritance, citizenship, and paternity may require researchers to trace how a given jurisdiction treated the rebuttal of that presumption at different points in time.
**Legitimacy intersects with citizenship and immigration.** In federal law, the legitimacy or illegitimacy of a child born abroad to a U.S. citizen parent has affected citizenship transmission under statutes that distinguished between legitimate and illegitimate children for purposes of citizenship by descent. These distinctions were themselves subjected to constitutional challenge.
**The vocabulary is not uniform across jurisdictions or across time.** Civilian-influenced states (Louisiana, and to a degree others) have legitimacy frameworks drawn more directly from Roman and French law, with different legitimation procedures than common-law states. Do not assume uniform rules.
**Modern sources largely replace "legitimacy" with "parentage."** Contemporary family law statutes in most states use the Uniform Parentage Act or similar frameworks that avoid the legitimate/illegitimate distinction almost entirely, establishing legal parenthood through a menu of methods (marriage, acknowledgment, adjudication, assisted reproduction). Searching historical sources requires the old vocabulary; searching modern sources may require the new one.
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Historical Dictionary Support
Rapalje & Lawrence does not contain a substantive entry for legitimacy or legitimate — the pages in the relevant portion of the source are occupied by unrelated entries (Leibnitz, Leidgrave). This is a notable gap in an otherwise broad legal dictionary of the period. The absence likely reflects either an editorial choice to treat legitimacy as sufficiently covered under related heads (bastard, inheritance, marriage) or a simple omission in the surviving portion of the text consulted.
Other major historical legal dictionaries — Bouvier's Law Dictionary in its successive editions, and Black's Law Dictionary from its first edition forward — give legitimacy substantial treatment, consistently centering the definition on birth within lawful wedlock and the presumption arising therefrom. Bouvier emphasizes the civil-law roots of legitimation by subsequent marriage and flags the divergence between common-law and civilian states. Black's successive editions track the constitutional erosion of illegitimacy disabilities beginning in later twentieth-century editions, making edition choice critical when using Black's for this term.
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Jurisdictional Note
American states diverged historically on whether legitimation by subsequent marriage was available (a civil-law principle not recognized at common law), and on the strength and rebutability of the presumption of legitimacy. Louisiana, following civilian tradition, recognized legitimation by subsequent marriage far earlier and more broadly than most common-law states. The Uniform Parentage Act, adopted in varying versions across many states since 1973 and revised in 2000 and 2017, has substantially replaced legitimacy-based analysis in adopting states, but the older framework persists in non-adopting states and in interpreting older instruments.
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Encyclopedia Cross-Reference
See Law Mind Encyclopedia: Parent and Child (for the common-law presumption of legitimacy and its rebuttal); Inheritance and Descent (for historical disabilities of illegitimate children in succession); Constitutional Equal Protection (for the constitutional dismantling of illegitimacy classifications).
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