Definition
The plural of PRIVY. Persons who stand in a legally recognized relationship to another party such that they are bound by, or entitled to the benefit of, legal proceedings, judgments, contracts, or interests in property to which they were not themselves direct parties. The relationship arises not from direct agreement between the persons but from a prior transaction, status, or legal operation that connects their interests.
Privies are classically grouped into six categories based on the nature of the connecting relationship:
(1) Privies in blood — heirs and ancestors, connected through inheritance. The heir is privy in blood to the ancestor whose estate descends to them.
(2) Privies in representation — personal representatives (executors, administrators) and the deceased. The executor stands in the place of the testator for purposes of the estate.
(3) Privies in estate — persons whose interest derives from a common conveyance or grant: donor and donee, lessor and lessee, grantor and grantee. The shared chain of title creates the privity.
(4) Privies in respect of contract only — where a lease creates personal obligations running between lessor and lessee that do not extend to their successors.
(5) Privies in respect of estate and contract combined — as where a lessee assigns their interest but the original contractual relationship between lessor and lessee persists, the lessor not having accepted the assignee.
(6) Privies in law — persons whose privity arises by operation of law rather than agreement or descent: the lord taking by escheat, a tenant by the curtesy, a tenant in dower, an incumbent of a benefice.
The core function of the concept is to define who, beyond the immediate parties to a transaction or judgment, is legally affected by it — whether bound by its terms, barred by its outcome, or entitled to assert rights under it.
Common Language
Modern common usage (Wiktionary): Plural of "privy" — outhouses or outdoor toilets; also, persons who are made aware of something private.
Historical common usage (Webster's 1913): "Privy" in common use meant private, secret, or a person privately knowing of something; also, an outhouse.
The gap between common and legal usage is significant. In everyday English, "privy to" something means privately informed of it. In law, being a privy to a transaction or judgment carries binding legal consequences — it is not merely a matter of knowledge but of legal relationship and legal exposure. A researcher encountering "privies" in a historical legal document should resist the instinct to read it as referring to those who simply had knowledge of an event.
Common Confusion
PRIVIES vs. PARTIES: Burrill's makes the key distinction explicit — privies are properly distinguished from parties, from whom they derive their title. A party is directly named in and bound by an instrument or proceeding. A privy derives their interest or obligation through a party, standing one step removed. In res judicata and estoppel analysis, courts extend preclusive effect to both parties and their privies, which is why the distinction matters: a privy who was not present at trial may nonetheless be bound by its outcome.
PRIVIES vs. THIRD PARTIES: A third party has no legally recognized relationship connecting them to a transaction or judgment. A privy, by contrast, has exactly such a connection. In contract law, the doctrine of privity of contract historically excluded third-party beneficiaries from enforcing agreements; some jurisdictions have relaxed this rule, creating overlap and confusion between "privy" and "intended beneficiary."
Why It Matters in Research
The term is structurally important across several areas of law, and researchers will encounter it in very different doctrinal contexts depending on the source.
In property and estates research, the six-category taxonomy (especially privies in blood, estate, and law) appears throughout treatises on real property and is essential for understanding conveyancing, descent, and the running of covenants with the land. Historical sources use these categories with precision; modern cases often collapse them.
In civil procedure and res judicata research, "privies" carries modern doctrinal weight. Courts extending claim preclusion or issue preclusion to non-parties rely on privity analysis, and the word appears frequently in appellate opinions discussing whether a party is bound by prior litigation. The historical taxonomy of the six kinds rarely appears in this context — modern courts use functional tests for privity that do not map cleanly onto Bouvier's or Blackstone's categories.
In equity and trust research, privity concepts intersect with the enforcement of equitable obligations. Whether an equitable interest or notice binds a successor depends partly on privity analysis.
Trap for historical research: In older sources, "privies" sometimes appears in passages about trespass and nuisance liability, where the question is whether someone connected to the original wrongdoer can be held responsible. This is a distinct usage from the property and procedure contexts and should not be conflated with either.
The term is also an entry point to PRIVITY (the abstract noun) — researchers who find "privies" in a case or treatise should follow the cross-references to privity of contract, privity of estate, and privity of blood as the relevant doctrinal nodes.
Historical Dictionary Support
The historical dictionaries agree on the core definition: privies are persons connected by a relation other than direct contract, whose interest derives from the transaction or conveyance of others. Black's (both editions) and Bouvier's present essentially identical formulations, with Bouvier's tracing the concept to Coke on Littleton (Co. Litt. 271a) and Wood's Institutes — the foundational common law sources.
Burrill's adds the most analytically useful gloss, explicitly distinguishing privies from parties — a point the other dictionaries treat as implicit. This distinction is the one that matters most in procedural contexts.
The six-category taxonomy appears in full in both editions of Black's and in Bouvier's. Anderson's simply cross-references PRIVY and adds nothing independent.
What the historical dictionaries do not address is the modern procedural use of the term in res judicata and collateral estoppel doctrine, where "privity" has been substantially reshaped by twentieth-century case law. Researchers relying solely on historical dictionaries will have a solid foundation for property questions but an incomplete picture for procedure.
Jurisdictional Note
American courts have developed varied and sometimes idiosyncratic functional tests for privity in the res judicata context that diverge from the classical categories. The Restatement (Second) of Judgments influenced many jurisdictions toward a broader, relationship-based analysis. Researchers working on preclusion questions should not assume that the historical six-part taxonomy controls in any particular jurisdiction.