Definition
In Roman and civil law, usus (Latin: "use") is the bare right to use another person's property for the purpose of supplying one's own daily necessities, without any right to enjoy the profits or fruits of that property beyond personal need. It is the most limited of the real rights recognized under Roman law, falling short of usufruct in both scope and duration.
The holder of usus, called the usuarius, could occupy or use the property only to the extent required for personal subsistence. Any use beyond that — including sharing the property with guests or taking surplus fruits — was outside the right. The right was personal and could not be transferred, assigned, or inherited.
As applied to land, usus was precarious in character: the usuarius held only so long as the owner found the arrangement convenient and was obliged to depart whenever the owner found the presence burdensome (molestus). This precariousness distinguished usus from stronger possessory interests. The analogous right over a dwelling was habitatio.
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Common Language
Modern common usage (Wiktionary): The use of something; also, widespread de facto usage, regardless of conformity to a standard.
Historical common usage: The term does not appear as an independent headword in Webster's 1913, reflecting its status as a Latin borrowing without substantial adoption into ordinary English.
Editorial note: In common usage, "usus" simply means use or practice. In Roman and civil law, it is a technical term of art denoting a specific, limited real right with defined boundaries — far narrower than the everyday sense of using something. A researcher encountering "usus" in legal texts should not read it as a generic synonym for possession or occupancy.
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Common Confusion
Usus is most frequently confused with ususfructus (usufruct). Both are real rights derived from Roman law, and both involve use of another's property. The distinction is material: usufruct grants the right to use and enjoy property, including taking its fruits and profits, subject only to not impairing the substance of the thing. Usus grants only the right to use, strictly limited to personal necessity, with no right to fruits beyond what the usuarius personally requires. A usufructuary may lease or share the property; a usuarius generally may not. In historical legal sources the two terms sometimes appear in proximity, and careless reading can obscure which right is being discussed.
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Recognized Forms
/SUBTYPES
Roman law recognized usus in relation to different types of property:
— Usus of land: the right of personal occupancy and use for daily needs.
— Habitatio: the analogous right of dwelling in a house, treated in some sources as a distinct right and in others as a species of usus applied to residential property.
Burrill notes that ususfructus and usus were the two principal personal servitudes of Roman law, with usus being the lesser.
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Why It Matters in Research
Usus is primarily a term of Roman and civil law, and researchers will encounter it most often in three contexts: treatises on civil law systems (Louisiana, Quebec, and European jurisdictions), historical English equity sources that drew on civilian learning, and discussions of the law of servitudes and personal rights in property.
The critical research trap is conflating usus with usufruct in historical secondary sources. Many nineteenth-century commentators used the terms loosely or translated both as "use," obscuring the Roman law distinction. When a historical source discusses "the right of use" in a civil law context, verify whether the author means usus strictly or is using the term as a shorthand for the broader usufructuary right.
In Louisiana law, which retains civilian property concepts, usus and usufruct remain operative legal categories. Researchers working in Louisiana property law or comparative law should consult both the civil code and civilian treatises rather than relying on common law dictionaries.
The Anderson's entry in the source material appears to be a misfiled fragment concerning usury, not usus — a reminder that dictionary entries in historical compilations occasionally suffer from typographical or binding errors that can mislead researchers scanning sources quickly.
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Historical Dictionary Support
Black's (1st and 2nd editions) and Rapalje & Lawrence present substantially identical accounts: usus as a precarious enjoyment of land, analogous to tenancy at sufferance or at will in English law, with the usuarius obliged to yield whenever the owner found continued occupation inconvenient. This English-law analogy was a standard device for making Roman concepts accessible to common law readers, but it is imprecise — tenancy at sufferance and tenancy at will arose from possession following a tenancy, not from the grant of a limited real right, and carry different legal consequences.
Burrill's entry is the most analytically precise of the historical sources. Burrill correctly distinguishes usus as use for daily necessity (ad necessitatem) from ususfructus as the broader right of using and enjoying at pleasure, and makes explicit that the usuarius had bare use but not the fruits of the thing. This formulation tracks the Roman texts most faithfully.
None of the historical dictionary sources adequately address the role of usus in modern civil law jurisdictions or its survival as operative law in mixed systems. For that, the historical dictionaries must be supplemented with civil code commentary.
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Jurisdictional Note
Usus as a living legal category survives primarily in civil law jurisdictions and mixed systems, including Louisiana, where the Civil Code recognizes the right of use as distinct from usufruct. In common law jurisdictions, the concept has no direct counterpart as an operative right, though the historical analogy to tenancy at sufferance appears in older equity and property scholarship. Researchers should apply civil law authority when analyzing usus in any jurisdiction with a civilian property tradition.
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