Definition
An archaic legal term with two distinct senses encountered in historical records and pleadings:
1. NUMMATA (general): The price or value of anything expressed in money. The term functioned as a monetary denomination unit, parallel to denariata (price reckoned in pence) and librata (price reckoned in pounds). Nummata referred to valuation in coin generally, without specifying denomination.
2. NUMMATA TERRAE: Literally, "a moneysworth of land." In medieval English land law, this phrase designated a unit of land equivalent to one acre — understood as the quantity of land whose annual value equaled a standard coin unit. The term appears in older conveyancing records, surveys, and glossaries of land measurement.
Common Confusion
Researchers may conflate the three parallel denomination terms: nummata (price in money/coin), denariata (price in pence, the penny-unit), and librata (price in pounds, the pound-unit). These are not synonyms — they represent different scales of monetary valuation applied to the same conceptual framework. Nummata is the broadest, denariata the smallest common unit, and librata the largest. The trio appears together in historical records and glossaries; treating any one as interchangeable with another will misread the valuation intended.
Why It Matters in Research
NUMMATA is essentially a dead term in modern law. Researchers will encounter it almost exclusively in two contexts: (1) medieval and early modern English land records, surveys, and conveyancing instruments, where nummata terrae appears as a land measurement designation; and (2) glossaries and legal dictionaries from the eighteenth and nineteenth centuries attempting to systematize archaic terminology for practitioners.
The principal research trap is treating nummata terrae as a fixed, universal measurement. Like many medieval land units — the virgate, the bovate, the carucate — acreage designations in historical records were locally variable. Spelman's Glossary, cited by both Black's editions and Rapalje & Lawrence, equates nummata terrae with one acre, but this equivalence reflects a general convention rather than a legally uniform standard enforceable across jurisdictions or time periods.
For researchers working in Law Mind's corpus on historical property law, feudal tenure, or land measurement terminology, nummata connects directly to the broader family of valuation-based land units, all of which defined land quantity by economic yield rather than geometric measurement. This is a conceptually important distinction from modern acreage, which is purely geometric. When a historical instrument uses nummata terrae, it signals a yield-based conception of land: the land worth one coin-unit annually, whatever physical extent that required.
The companion maxim preserved in Rapalje & Lawrence — Nummus est mensura rerum commutandarum ("Money is the measure of things to be exchanged") — provides the philosophical underpinning of this entire family of terms and may be useful in researching early commercial law theory alongside property law.
Historical Dictionary Support
All three source dictionaries agree on the core definition: nummata is the price of a thing expressed in money, distinguished from denariata and librata by denomination scale. The entries are substantially identical in this regard, suggesting common derivation from Spelman or a shared intermediary source.
The significant divergence is in scope. Rapalje & Lawrence is the most complete of the three, preserving the companion phrase nummata terrae with attribution to Spelman's Glossary and appending the Latin maxim on money as a measure of exchange. Black's first edition includes nummata terrae with the Spelman citation. Black's second edition, however, omits nummata terrae entirely and introduces what appears to be a typographical corruption ("a8 denarfata") in place of "as denariata" — a textual error researchers should note when relying on that edition.
None of the three dictionaries engages with the variability of nummata terrae as a land measure or situates the term within the broader system of medieval English land valuation. Researchers should treat these entries as entry points requiring supplementation from Spelman directly and from historical land-law scholarship.
Jurisdictional Note
Nummata is a term of English medieval law and appears almost exclusively in records and scholarship rooted in that tradition. It has no recognized usage in American common law as an operative legal standard and would appear in American legal materials only through antiquarian reference or chain-of-title work involving early colonial grants drawing on English precedent.