Definition
Latin: "of public right." A term applied to things or rights that belong to the public at large and are open to use or enjoyment by all persons. Something is publici juris when no individual or private entity holds exclusive dominion over it — it is either owned collectively by the entire community or so fundamental to common use that the law treats it as available to everyone.
The term operates in two related but distinct senses:
1. Common property open to all: Things such as light, air, and navigable waters are publici juris because any person may make use of them. No individual can appropriate these resources to the exclusion of others, and the law will not recognize a private property claim in them as against the general public.
2. Public ownership by the state or community: Things owned by the public in its organized, governmental capacity — roads, public squares, navigable riverbeds in many jurisdictions — are publici juris in the sense that they belong to the state as trustee for the people and are dedicated to public use.
Common Confusion
Publici juris is sometimes treated as interchangeable with res communes (things common to all by nature) and res publicae (things belonging to the state). The distinctions are real though frequently blurred in historical sources. Res communes refers to things incapable of ownership by anyone — the open sea, the air — which are available to all simply by their nature. Res publicae are things the state actually owns and administers, such as public buildings or highways. Publici juris is broader and functions more as a legal characterization — a conclusion that a thing or right is public in character — than as a formal category of property. A court describing a right as publici juris is saying it cannot be monopolized by private parties, regardless of which underlying category technically applies.
Also note: Burrill's entry directs readers to "juris publici," which is the inverted form of the same phrase. Both forms appear in historical sources and carry equivalent meaning.
Why It Matters in Research
Researchers encounter publici juris most frequently in three contexts: public rights disputes, intellectual property and trademark history, and public trust doctrine cases.
In public rights and nuisance cases, courts from the 18th through early 20th centuries invoked publici juris to establish that interference with navigable waters, highways, or air and light could constitute a public wrong — not merely a private one. Finding this reasoning in older opinions requires recognizing the Latin phrase, because the underlying concept is not always translated for the reader.
In early trademark and trade name law, courts used publici juris to describe words or symbols that had passed into common use and could no longer be appropriated as exclusive marks. A term that became descriptive or generic was said to have become publici juris. This usage appears frequently in 19th and early 20th century intellectual property opinions and treatises, and it is a distinct application from the property-law sense.
The phrase appears rarely in contemporary American legal writing, having been largely replaced by plain-English equivalents. This creates a gap: searching modern databases for the underlying concept (public trust, commons, generic marks) will not surface older cases and treatises that used publici juris as the operative term. Researchers working backward through historical materials should treat the Latin phrase as its own search term.
Bouvier's entry under this heading pivots almost immediately to the unrelated term Publiciana — a Roman-law action for recovery of lost property analogous to trover. Researchers using Bouvier as a starting point should not conflate these entries; Publiciana is procedural and historically specific, while publici juris is a substantive classification with ongoing doctrinal relevance.
Historical Dictionary Support
Black's (both editions) and Burrill's are in accord on the core meaning: something is publici juris when it is public property or common property available to all. Black's draws on Sweet's dictionary for the examples of light, air, and public water — a choice that grounds the term firmly in the natural-resources and nuisance tradition. Burrill supplements with a citation to Kent's Commentaries, which situates the concept within American common law reception of civilian property categories.
Bouvier's is the outlier. The entry for publici juris is truncated and immediately gives way to Publiciana, suggesting an editorial gap rather than a deliberate treatment. Researchers relying on Bouvier alone for this term will find it inadequate.
None of the historical dictionaries address the trademark-law usage, which developed substantially in American courts after the major editions of these works were compiled. That silence is historically informative: the extension of publici juris reasoning to marks and trade names was a judicial development, not a codified doctrine, and it does not appear in the foundational reference works.
Jurisdictional Note
The public trust doctrine — the modern American expression of much of what publici juris historically described — varies considerably by state, particularly regarding navigable waters and tidelands. Civil law jurisdictions (notably Louisiana) retain closer formal ties to the Roman-law categories underlying this term, and historical Louisiana sources may use publici juris with greater precision than common law sources from other states.