Definition
Acceptatio is a Latin term drawn from Roman and civil law, used in two related but distinct legal contexts:
1. Mercantile law: The formal acceptance of a bill of exchange — the act by which a drawee acknowledges the bill and binds themselves to pay it according to its terms.
2. Civil law: The assent of the person to whom a promise is made — the act of agreement that completes a binding obligation between promisor and promisee.
Both senses share a common core: acceptatio is the operative act of consent that transforms a unilateral offer or instrument into a binding legal obligation.
Common Confusion
Acceptatio should not be conflated with its English derivative "acceptance," which carries a broader range of meanings in modern contract law (offer and acceptance, acceptance of goods, acceptance of a deed). Acceptatio, as used in historical and civil law sources, is a more precise term. In the mercantile sense it refers specifically to the acceptance of a bill of exchange, not to contractual acceptance generally. Researchers encountering acceptatio in civil law texts should be careful not to read modern common-law contract doctrine backward into the term.
Why It Matters in Research
This term surfaces almost exclusively in pre-modern civil law treatises and in historical mercantile law sources. Researchers will encounter it most often when working with materials drawn from the ius commune tradition, early commercial law texts, or natural law theorists such as Grotius. The dual usage — one mercantile, one civil — means context is decisive. A passage in a treatise on bills of exchange uses the term differently from a passage in a work on the law of obligations.
The Grotius citation in Burrill (De Jure Belli ac Pacis, Book 2, Chapter 11) connects acceptatio to the natural law theory of promise and consent, where the assent of the promisee was analyzed as a necessary component of obligation. This is significant for researchers tracing the intellectual lineage of offer-and-acceptance doctrine in common law, which absorbed and reformulated these civil law concepts during the eighteenth and nineteenth centuries.
In the bills of exchange context, the Heineccius citations (De Cambiis) situate acceptatio within the learned commercial law tradition that preceded and informed modern negotiable instruments law. Researchers working on the history of negotiable instruments, banking law, or lex mercatoria will find this term as a technical marker indicating engagement with that continental scholarly tradition.
Because acceptatio appears in Latin-language source material, it is largely absent from English-language common law reports and statutes. When it does appear in English legal writing, it is almost always a deliberate signal that the author is drawing on civil or mercantile law scholarship rather than domestic common law authority.
Historical Dictionary Support
Burrill's Law Dictionary is the primary English-language source for this term. Burrill's entry is compact but well-sourced, pointing to Heineccius for the mercantile sense and Grotius for the civil law sense. The structure of the entry reflects the dual-use character of the term without attempting to collapse the two meanings.
What historical dictionaries do not provide — and what Burrill's entry accordingly omits — is any treatment of how acceptatio was adapted, translated, or transformed as English law developed its own vocabulary of acceptance in contract and negotiable instruments. That transition is not visible in dictionary entries; it must be traced through the treatise literature and case law of the eighteenth and nineteenth centuries.
Jurisdictional Note
Acceptatio as a technical term is not operative in modern common law jurisdictions, which use "acceptance" in its English form. The term retains relevance in civil law jurisdictions that preserve Latin-derived terminology in commercial and obligations law, and in any jurisdiction whose legal history involved direct engagement with the ius commune tradition.