Definition
A granddaughter. In Roman civil law and in the early common law traditions that drew on it, neptis denotes a female grandchild — the daughter of one's son or daughter. The term appears in succession contexts, where precise identification of degrees of relationship governed inheritance rights.
Common Language
Modern common usage (Wiktionary): Not in general modern English use; neptis is a Latin term with no living English cognate in ordinary speech.
Historical common usage (Webster's 1913): Not listed. The English word "niece" descends from the same Latin root through Old French, but by 1913 "niece" had settled into its modern meaning of a brother's or sister's daughter, not a granddaughter.
The critical gap: In classical Latin, neptis meant granddaughter, not niece. English borrowed the word's sound but shifted its meaning entirely. A researcher encountering neptis in a medieval legal text and glossing it through the lens of modern "niece" will misread the degree of relationship — and therefore the inheritance right — by a full generation.
Common Confusion
Neptis and nepos travel together in Roman law texts, and both have suffered the same semantic drift in their English descendants. Nepos (grandson) became the root of "nephew," which now means a brother's or sister's son rather than a grandson. Neptis presents the same trap in the feminine. Additionally, Britton renders neptis as "nece," and old Scotch sources use "neipce" — both forms that a modern reader will instinctively read as "niece" in its current sense. Do not treat these medieval renderings as equivalent to the modern English word.
Why It Matters in Research
Succession and inheritance records are the primary site of encounter. In Roman law, the third degree of intestate succession under the Institutes organized heirs by proximity of blood, and neptis appears in those degree tables as a named category. Any researcher working with medieval English or Scots law texts that borrow civilian inheritance frameworks — Bracton and Britton being the principal examples — will find neptis or its vernacular equivalents used in their original Latin sense: granddaughter, not niece.
The semantic drift from "granddaughter" to "niece" happened gradually through Old French and into Middle English. This means that the same word, appearing in sources of different periods or in different languages, can mean two different things. A Latin source from any period uses neptis to mean granddaughter. A Middle English or early modern vernacular source using "nece" or "neipce" may intend either meaning depending on the date and context of the document.
Scots law materials deserve particular attention. Burrill flags the Scots equivalent neipce, and researchers in Scottish succession records should not assume that the Scots term tracks the modern English "niece" without verifying the period and context. The civilian inheritance framework persisted longer in Scots law than in English law, making the older Latin sense more durable in Scottish sources.
Cross-referencing to nepos is essential when tracing family relationships through any inheritance dispute in these sources, as the male and female terms appear together in degree tables and must be read as a pair.
Historical Dictionary Support
The three historical dictionaries converge completely: neptis means granddaughter, full stop. Black's (both editions) gives the bare translation without elaboration. Burrill is more useful for the researcher, providing the primary civilian source (Institutes 3.6.1), the Bracton citations (folios 67 and 68), the Britton vernacular rendering ("nece," chapter 119), and the Scots law equivalent (neipce). The Latin dictionary entry confirms the classical usage with citations to Cicero and notes the unusual feature that neptis, like nepos, could in rare inscriptional usage appear in grammatically unexpected gender constructions — a curiosity for the epigrapher but not of practical significance for legal research.
What the historical dictionaries do not address is the semantic drift problem. None of them warns the reader that English "niece" and Latin neptis, though historically related, no longer mean the same thing. That gap is the researcher's responsibility to bridge.
Encyclopedia Cross-Reference
See Law Mind Encyclopedia: Roman Law of Succession; Degrees of Consanguinity; Bracton and the Civilian Tradition in English Law.