Definition
In civil law, arrhabo (also spelled arrha, arrhae, or arrhæ) is earnest money — a sum of money or other valuable thing given by the buyer to the seller at the time of contracting, for the purpose of evidencing and binding the agreement. It functions as a token of the parties' mutual commitment to complete the transaction. The arrhabo is not the purchase price itself but a preliminary payment signaling that a bargain has been struck.
Common Language
Modern common usage (Wiktionary): No standard entry. The term is not in ordinary modern English usage.
Historical common usage (Webster's 1913): Not listed as a common English word. The concept it describes, however — earnest money or a pledge given to seal a deal — appears in popular usage through the related term "earnest."
Editorial note: Because arrhabo has no parallel in ordinary modern English, the COMMON LANGUAGE section is largely inapplicable. Researchers should note that the functional concept survives robustly in everyday commercial and real estate contexts under the name "earnest money" or "deposit," even though the Latin term itself has dropped from common use entirely.
Common Confusion
Arrhabo is frequently run together with the related term arrha (or arrhae/arrhæ), and some editions of Black's treat them as interchangeable. They are closely connected but technically distinct in classical civilian usage: arrha (plural arrhæ) is the broader Roman law category, while arrhabo derives from Greek usage absorbed into Roman practice. In research contexts, the distinction rarely matters — both refer to the same functional institution of earnest money — but a researcher encountering either spelling in a primary source is looking at the same underlying concept. Do not confuse arrhabo with a down payment in the modern contractual sense; the arrhabo was primarily evidentiary and symbolic in origin, not a partial satisfaction of the price.
Why It Matters in Research
This term appears almost exclusively in sources treating Roman and civil law foundations of contract. Researchers working in common law jurisdictions will encounter arrhabo only in historical treatises, comparative law materials, or glossaries tracing the ancestry of earnest money doctrine. It does not appear in modern American or English case law under this name.
The practical importance for corpus research is terminological: when reading 17th- through 19th-century legal dictionaries, treatises on the law of contracts, or commentaries on sale, a researcher may encounter arrhabo, arrha, or arrhæ where a modern source would simply say "earnest money" or "deposit." Failure to recognize the equivalence can cause researchers to undercount or mischaracterize references to pre-contractual binding payments in historical sources.
The entry in Black's 1st edition is slightly more expansive than the 2nd edition, noting that arrhæ were given "for the purpose of evidencing the contract" — a nuance that matters for understanding whether the payment was forfeit on breach or merely returned. Researchers tracing the forfeiture-versus-restitution debate in earnest money doctrine should note that Roman law sources treat the arrhabo as presumptively forfeit to the seller if the buyer withdrew, and recoverable doubled by the buyer if the seller withdrew — a rule that influenced civil law systems but did not transfer cleanly into common law earnest money practice.
Historical Dictionary Support
Both editions of Black's are in agreement on the core definition: arrhabo is earnest money in the civil law, money given to bind a bargain, with attribution to Calvin (Johannes Calvinus, Lexicon Iuridicum, a standard reference work of the period). The 1st edition goes modestly further, identifying the giver as the buyer and the purpose as evidentiary — "for the purpose of evidencing the contract" — which aligns with the Roman law source material in Justinian's Institutes and Digest. The 2nd edition strips back to the bare minimum.
Neither edition addresses the forfeiture mechanics, the Greek origins of the term, or the divergence between civil law arrha and common law earnest money. Researchers should treat Black's entries here as a signpost, not a full account. For substantive civilian doctrine, Pothier's Treatise on the Contract of Sale and the Corpus Juris Civilis provide the necessary depth that the dictionary entries omit.
Jurisdictional Note
Arrhabo as a term of art belongs to civil law systems. It has no operative role in American common law or English law under this name. Researchers in Louisiana, Quebec, or other mixed civil law jurisdictions may find the concept more directly relevant when tracing the historical foundations of deposit and earnest money rules in those systems.