Definition
In civil law, arra (also spelled arrha, arræ, or arraæ) is earnest money — a sum or token given by one party to another at the time of contracting as evidence that a binding agreement has been reached. The giving of arra signified that the bargain was complete, not merely pending. The term applied to contracts generally, including contracts of marriage, where arra could take the form of a pledge or gift exchanged between parties to seal the agreement.
Arra served two related but distinct functions in Roman and civil law practice: evidentiary (proving that agreement had occurred) and sometimes confirmatory (reinforcing the parties' mutual obligation). In some civil law traditions, arra was further classified as either confirmatory — a mere token of the deal — or penitential — a sum the forfeiting party would lose as the price of withdrawing.
Common Language
Wiktionary (modern common usage): An alternative form of "ara," referring to a Bhutanese alcoholic beverage.
Webster's 1913: No entry for arra in this sense; the term did not enter general English usage.
Editorial note: The common-language meaning is entirely unrelated to the legal term. The Bhutanese beverage sense is a phonetic coincidence with no shared derivation. Researchers encountering "arra" in a legal source can disregard the Wiktionary definition entirely.
Common Confusion
Arra/arrha/arræ are variant spellings of the same concept, not distinct legal institutions. Burrill notes that Calvin and Brissonius use the form arra, while modern editions of the Corpus Juris Civilis standardized the spelling as arrha. Researchers should treat all variants as equivalent when searching historical sources. The related English term arraes (arreæ) appears in Bracton and Fleta in the context of English land sale practice, where receipt of earnest by the seller was a condition of binding the vendor — a usage that overlaps with but is not identical to the Roman civil law concept.
Do not confuse arra with arles (also earnest money) in Scots and early common law contexts, which derives from a different textual tradition though it serves a comparable practical function.
Why It Matters in Research
Spelling variation is the primary research hazard. Historical sources index this term under arra, arrha, arræ, arraæ, and arreæ interchangeably. A search limited to one spelling will miss relevant passages. Burrill explicitly flags this variation, and Black's (both editions) notes the arrha/arræ alternation. Any corpus search should include all forms.
The term appears most frequently in civil law treatises, Roman law commentary, and sources drawing on the Corpus Juris Civilis. It surfaces in English legal sources primarily through Bracton and Fleta, where the concept was adapted to common law land conveyancing practice — but with meaningful modification. In English usage (arreæ), the focus falls on receipt by the seller as a condition of binding the vendor, which is a narrower and more procedural application than the Roman evidentiary function.
Researchers working on contract formation, earnest money clauses, or the history of consideration doctrine will find arra-adjacent material in civilian sources that predates and runs parallel to common law earnest money doctrine. The two traditions converge but should not be conflated: civil law arra was evidence of agreement already reached; common law earnest money developed more complex rules about option-like effects and forfeiture.
For researchers working in Scottish, Louisiana, Quebec, or other mixed-jurisdiction materials, arra and its cognates may carry more operational weight than in pure common law sources.
Historical Dictionary Support
All four source dictionaries agree on the core definition: arra is earnest money signifying a completed bargain in civil law. Black's (both editions) and Bouvier's are substantively identical. Burrill adds the most useful research intelligence: the spelling note distinguishing Calvin/Brissonius usage from Corpus Juris Civilis editions, and the separate entry for arreæ drawn from Bracton and Fleta.
Bouvier's entry as captured in the source material appears fragmentary — the text opens mid-sentence ("veyor of land") — suggesting a transcription artifact. Researchers consulting Bouvier's directly should verify the full entry context.
None of the historical dictionaries address the penitential/confirmatory distinction that appears in more extended civil law treatment of arra. For that analysis, researchers should proceed to civilian sources beyond these dictionaries, particularly commentary on Justinian's Institutes and Digest provisions on sale (emptio venditio).
Jurisdictional Note
Arra is a civil law term with no direct common law analog, though the functional concept (earnest money) exists in both traditions. Its practical significance is greatest in jurisdictions with civilian heritage — Louisiana, Quebec, and in historical sources from Spanish and French colonial legal practice. In pure common law jurisdictions, the concept appears only in historical and comparative legal scholarship.