Definition
A Latin phrase meaning "between other persons" or "among others." It identifies persons who are strangers to a particular transaction, proceeding, or matter — that is, parties who were not involved in and are therefore not bound by what occurred between others. The phrase most commonly appears in the maxim that acts or agreements made between certain parties cannot prejudice or benefit those who were not parties to them.
Common Language
Modern common usage (Wiktionary): "Among other people."
Historical common usage: Not listed as a standalone entry in Webster's 1913; the phrase functions as Latin in general use with the same literal sense — among or between others.
The gap between lay and legal usage is subtle but important. In ordinary language, "among others" is a throwaway qualifier meaning "including additional unnamed parties." In legal usage, inter alios carries structural weight: it marks the boundary of privity, identifying who stands outside a legal relationship and therefore cannot be bound by, or take advantage of, what passed between those inside it.
Common Confusion
INTER ALIOS vs. INTER ALIAS / INTER ALIA: Researchers frequently conflate inter alios with inter alia, which means "among other things" and refers to items, not persons. Inter alios concerns parties; inter alia concerns subject matter. The confusion is easy in older legal writing where Latin phrases appear in dense proximity and abbreviation is common. A secondary risk: inter alios is sometimes misprinted or transcribed as inter alias in older manuscript sources, which is neither standard Latin nor a recognized legal term.
INTER ALIOS vs. RES INTER ALIOS ACTA: Res inter alios acta is the specific evidentiary doctrine — that things done or said between others are not admissible or operative against strangers to those acts. Inter alios is the broader relational phrase; res inter alios acta is its principal doctrinal application. See RELATED TERMS.
Why It Matters in Research
Inter alios appears in two overlapping contexts that researchers must keep distinct.
First, as a relational descriptor, it signals that a person, document, or transaction is being identified as outside the legal relationship under discussion. When a court or treatise writer describes a contract as binding "inter alios" or characterizes someone as standing inter alios, they are making a point about privity — the person is a stranger to the arrangement and neither burdened nor benefited by it.
Second, it is the root of the evidentiary maxim res inter alios acta alteri nocere non debet (things done between others ought not to harm a stranger), which underlies the common law rule against admitting evidence of collateral transactions or agreements to affect the rights of non-parties. Historical sources, particularly pre-twentieth-century treatises and reporters, invoke this maxim with varying levels of precision. Researchers reading older English equity or common law materials should expect to encounter inter alios as shorthand for this entire body of principle without the maxim being spelled out.
The phrase also appears in contexts involving releases, judgments, and admissions. A release executed inter alios — between parties to a dispute — historically had limited reach: it could not extinguish claims or defenses belonging to strangers. Courts in equity and at common law worked out the contours of this principle across centuries of litigation over co-obligors, sureties, and joint tortfeasors, and inter alios serves as a navigational marker in those bodies of doctrine.
In the Law Mind corpus, the phrase surfaces in estates and trusts materials in connection with inter vivos transactions — gifts and trust transfers made during life between living parties — where the question of who is and is not a party to the arrangement bears directly on rights at death. It also appears in property law discussions of delivery and acceptance in gift doctrine, where the inter alios character of a transaction may be contested.
Historical Dictionary Support
Black's Law Dictionary (both editions) gives essentially the same entry: "Between other persons; between those who are strangers to a matter in question." This is accurate but thin — it supplies the literal translation without contextualizing the doctrinal weight the phrase carried.
Burrill's Law Dictionary is more useful. Burrill anchors inter alios to the specific Civilian maxim drawn from the Codex (Cod. 7.60.1, 2): that things done between others cannot prejudice third parties. This is the critical doctrinal connection that Black's omits. Burrill also cross-references res inter alios, correctly treating it as the primary doctrinal home for the principle. Researchers using Black's alone may underestimate the phrase's doctrinal reach. Burrill's entry, despite being briefer in word count, is the more instructive of the two for understanding how inter alios functions in a legal argument rather than merely in a Latin glossary.
Encyclopedia Cross-Reference
Revocable Inter Vivos Trusts as Will Substitutes (The Law Mind Trusts, Estates & Probate Encyclopedia)
Personal Property — Gifts (Inter Vivos, Causa Mortis — Delivery, Intent, Acceptance) (The Law Mind Property Law Encyclopedia)