Definition
A Latin phrase meaning "out of purchase" or "founded on purchase." Ex empto describes a legal action or right arising from a contract of sale — specifically, the buyer's action against a seller to enforce obligations created by the purchase agreement. The term is most closely associated with the Roman law actio ex empto, the buyer's remedy under a contract of emptio venditio (sale), which could be used to compel delivery of the thing sold, to recover damages for defects, or to enforce other seller obligations. Bracton adopted the term into early English legal writing, making it one of several Roman law concepts that entered the medieval common law vocabulary through civilian influence.
Common Confusion
Ex empto is sometimes loosely grouped with ex vendito (out of sale, the seller's corresponding action) without recognizing that the two are formally distinct. Ex empto belongs to the buyer; ex vendito to the seller. Researchers encountering either term in historical sources should confirm which party is asserting the action before drawing conclusions about the legal posture of the dispute.
Why It Matters in Research
The primary research significance of ex empto is historical and terminological. The phrase appears in Bracton's De Legibus et Consuetudinibus Angliae (around fol. 102) as part of his systematic incorporation of Roman and canon law concepts into an account of English law, at a time when the two traditions were actively in dialogue. Researchers working in medieval legal manuscripts or early treatise literature will encounter ex empto as a marker of that civilian influence — not as a term of art in the English common law of contract as it later developed.
By the time the action of assumpsit matured in the sixteenth and seventeenth centuries, English courts had largely displaced Roman actiones with common law forms of action. Ex empto does not appear as a live pleading term in post-medieval English practice. Its presence in a source is therefore a dating and tradition signal: a document or treatise using ex empto is either drawing directly on Roman law, translating civilian sources, or operating in a jurisdiction (such as Scotland or South Africa) where the Roman-Dutch or civil law tradition remained active.
Researchers in Louisiana, Quebec, or South African legal history will find ex empto and its associated vocabulary substantially more operative than in English common law jurisdictions. The actio ex empto survived in Roman-Dutch practice and feeds directly into the modern law of sale in mixed jurisdictions.
When indexing or searching the Law Mind corpus, note that Black's (1st and 2nd editions) and Bouvier's cross-reference ex empto to actio ex empto — researchers should follow that cross-reference, as the fuller doctrinal content lives under that head. Burrill likewise directs the reader to actio ex empto. The standalone entry for ex empto in historical dictionaries is deliberately brief; the substantive law is under actio.
Historical Dictionary Support
All four source dictionaries — Black's (1st ed.), Black's (2nd ed.), Bouvier's, and Burrill's — give substantially identical definitions: "out of purchase; founded on purchase; a term of the civil law adopted by Bracton," with uniform citation to Justinian's Institutes 4.6.28 and Bracton folio 102. The consistency across sources reflects that this is a fixed term of civilian art, not one whose meaning evolved or was contested between dictionaries. None of the source entries attempt to describe the substantive elements of the action itself; all redirect to actio ex empto for doctrinal content. This is a notable gap: a researcher relying solely on the standalone dictionary entry will find only the translational gloss, not the operative legal rules.
Bouvier's entry is the only one that provides meaningful context by positioning ex empto alongside neighboring Latin phrases (ex facto, ex gratia), giving some sense of the dictionary's organizational logic and the phrase's place in the civilian lexicon. Neither Black's edition elaborates beyond the bare definition and citations.
Jurisdictional Note
In common law jurisdictions, ex empto is purely a historical and academic term with no operative procedural significance. In mixed civil law jurisdictions — particularly Louisiana and South Africa — the Roman law of sale, including the buyer's actio ex empto, remained foundational to contract doctrine well into the modern period and may appear in case law and commentary as a recognized concept rather than mere historical reference.