Definition
In old legal records, a bank of earth cast up alongside a ditch; the side or embankment of a ditch. The term appears in medieval Latin (Law Latin) documentary sources and is not in active use in modern legal practice. Its relevance is confined to the interpretation of historical land records, surveys, and conveyancing documents, particularly those originating in England.
Common Language
Modern common usage (Wiktionary): "Duna" refers to the Daugava, a river in eastern Europe.
Historical common usage (Webster's 1913): Not listed. The term did not enter general English usage.
The gap here is notable: a researcher encountering "duna" in a modern geographic or Eastern European legal context will find no meaningful connection to its Law Latin sense. The river reference and the land-record term share nothing but spelling. Context is essential — if the document is a medieval English charter or land survey, the legal meaning applies; if the source is modern or continental European, it almost certainly does not.
Common Confusion
Duna should not be confused with dune (a natural sand formation shaped by wind), though both ultimately describe elevated earthen features. The legal term duna specifically denotes a man-made embankment produced by digging — the earth thrown up from a ditch — not a natural geographic formation. It also should not be conflated with dungeon, which Rapalje & Lawrence defines in the same entry cluster by proximity, not by relationship. The two terms are unrelated in meaning.
Why It Matters in Research
Researchers working in medieval English land records, monastic chartularies, or early conveyancing instruments may encounter duna as a boundary marker or physical description of a property feature. In such documents, ditches and their associated banks (duna) served as common demarcations of field boundaries, drainage works, and estate limits. Misreading duna as a place name, personal name, or unrelated geographic feature could materially distort the interpretation of a boundary description.
The term is essentially dead in modern legal usage. Its appearance in a document is almost certain evidence of significant historical age — likely medieval or early modern. Researchers should treat it as a terminus technicus of conveyancing Latin, not as vernacular description.
No significant evolution of meaning is documented across the historical sources. All four dictionaries agree closely, suggesting the term was stable and narrow throughout its period of use.
Historical Dictionary Support
All four sources — Black's (1st ed.), Black's (2nd ed.), Rapalje & Lawrence, and Burrill's — converge on the same definition without meaningful divergence: a bank of earth cast up from a ditch, or the side of a ditch. This consistency across independent compilations indicates the term carried a precise, settled meaning within its documentary context.
Each source traces the definition to Cowell (John Cowell, The Interpreter, 1607), the principal early authority on Law Latin and legal antiquities. Burrill adds a secondary manuscript citation — Chartular. Glaston. MS. 75 — referencing the Glastonbury Chartulary, a medieval monastic land record, which situates the term firmly in English ecclesiastical and estate documentation.
What the historical dictionaries do not address: practical guidance on how duna interacts with adjacent boundary terminology (such as fossatum for ditch, or metes and bounds conventions more broadly). Researchers needing that context will need to consult specialized treatments of medieval English land law and diplomatic sources beyond the standard law dictionaries.
Jurisdictional Note
Duna is effectively an English Law Latin term. Its documented use is in English historical records. Researchers working in Scottish, Irish, or continental European historical sources should not assume equivalent meaning without independent verification in those documentary traditions.