Definition
In old English legal records, *duodena* is a Latin term meaning a body of twelve men — that is, a jury. The term derives from the Latin for "twelve" and appears in medieval and early modern legal documents as a formal designation for the twelve-person jury. In some records it extends to a more general numerical sense: a dozen of any countable thing.
Common Language
Modern common usage (Wiktionary): The plural of *duodenum* — the anatomical term for the first section of the small intestine.
Historical common usage (Webster's 1913): Not attested in Webster's 1913 as an independent entry; *duodenum* appears there as the anatomical term.
The gap here is substantial and can mislead a researcher encountering the term outside a legal context. The modern reader's only point of reference for *duodena* is likely anatomical. In legal records the word has nothing to do with anatomy. It is a count noun meaning twelve men assembled as a jury, or a dozen of any commodity. Anatomical and legal uses are entirely unrelated, sharing only their Latin root in the number twelve.
Common Confusion
Do not confuse the legal *duodena* with the anatomical *duodena* (plural of *duodenum*). The anatomical term entered English medical writing considerably later than the legal term's period of active use; a researcher encountering *duodena* in a medieval or early modern legal manuscript should read it as a jury of twelve, not as an anatomical reference. Equally, do not read it as synonymous with *jury* in every modern sense — see WHY IT MATTERS IN RESEARCH below.
Why It Matters in Research
*Duodena* is an archaic Latin term confined almost exclusively to old English records and early legal treatises. Several research considerations apply:
**Chronological scope.** The term belongs to the Latin-record era of English legal practice — broadly, pre-modern documents where court rolls, plea rolls, and related instruments were kept in Latin. Researchers working in translated or modernized versions of those records may never encounter *duodena* at all; it tends to surface when working with original Latin text or close transcriptions.
**Numerical breadth.** Burrill's entry is the most useful here because it records the term's wider meaning. *Duodena* could denote a dozen of anything — bread, thread — not only a jury. When reading old pleading records or account rolls, the word in a non-judicial context almost certainly means a dozen of a commodity rather than a jury. The specific phrase *duodena panis* (a dozen of bread) illustrates this. A researcher scanning for jury-related terms should not automatically read every instance of *duodena* as referring to a petit jury.
**Relationship to the Twelve Tables.** Burrill also records a Greek variant — *duodeka delton* — used in the civil law (Justinian's Code) to refer to the Roman law of the Twelve Tables. This is an entirely distinct usage. Researchers working in civil law sources or comparative legal history should be alert to this usage, which has no connection to the English jury institution.
**Indexing and search.** Because *duodena* as a legal term is essentially defunct, it does not appear in modern legal indexes or digests under that spelling. Researchers may locate it only through full-text searches of digitized Latin records or through references in historical treatises. The anatomical homograph creates noise in general-purpose database searches.
Historical Dictionary Support
All four source dictionaries agree on the core definition: a jury of twelve men, citing Cowell's *Interpreter* as authority. There is no meaningful divergence on that primary meaning.
Burrill's entry is the most expansive and adds the most research value. It alone records the commodity usage (bread, thread) with citations to Townshend's *Pleadings* and extends the entry to the civil law Greek designation for the Twelve Tables. The other three dictionaries — Black's first edition, Black's second edition, and Rapalje & Lawrence — are essentially identical in their brevity, each reducing the term to a one-line definition. None of the source dictionaries offers substantive discussion of how the term was used in practice or how frequently it appears in the record corpus.
The universal citation to Cowell reflects the term's status as an antiquarian curiosity even in the nineteenth century; by the time these dictionaries were compiled, *duodena* had long passed out of active legal use and was preserved mainly as a lexicographical entry rather than a living term.
Jurisdictional Note
*Duodena* is an English common law term of record rooted in the Latin legal practice of medieval England. It has no meaningful presence in American legal usage and does not appear in post-colonial American sources as a term of art. Researchers will encounter it almost exclusively in English legal history and comparative jury scholarship.