Definition
A Latin phrase meaning "between themselves" or "among themselves." Used in legal contexts to describe rights, obligations, duties, or relationships that exist exclusively as between the parties to an agreement or legal arrangement, as distinguished from rights or duties owed to the world at large or to third parties. The phrase signals that a rule, liability, or entitlement operates internally — within a defined group such as partners, co-owners, joint venturers, or co-obligors — rather than externally.
The phrase appears most commonly in partnership law, where it distinguishes the internal allocation of rights and duties among partners from the partnership's legal posture toward outside creditors or third parties.
Common Language
The phrase has no meaningful common usage outside legal and scholarly Latin. It is pure legal and academic Latin with no ordinary English counterpart. The COMMON LANGUAGE section is omitted accordingly.
Why It Matters in Research
The practical importance of inter sese lies in the distinction it draws between internal and external legal relationships. In partnership law, the phrase does substantial work: the rule that partners share profits and losses equally may govern inter sese — among the partners themselves — while leaving entirely separate the question of how creditors may proceed against any one partner for the whole debt. These two questions are governed by different bodies of law and produce different outcomes, and conflating them is a recurring source of confusion in historical sources.
Researchers reading older partnership cases and treatises will encounter inter sese used precisely to mark this boundary. When a court or commentator says a provision operates "inter sese," they are signaling that the rule binds the partners to one another but does not limit third-party rights or alter external liability. Missing this signal can cause a researcher to misread the scope of a holding.
The phrase also appears, though less frequently, in co-tenancy, joint obligation, and corporate shareholder contexts, always carrying the same structural meaning: the relationship described is internal to the named group.
Because inter sese is Latin shorthand rather than a defined legal term of art with formal doctrinal content of its own, it does not evolve or shift meaning across jurisdictions or eras the way substantive legal terms do. Its meaning is stable. The researcher's task is simply to recognize it and understand what it is contrasting — namely, rights or duties that run outward, to strangers or creditors.
Historical Dictionary Support
Burrill's Law Dictionary provides the entry in its most compressed form: "Between or among themselves," with a single citation to Story on Partnership § 405. That cross-reference to Joseph Story's treatise on partnership is instructive. Story used inter sese to describe the internal accounting obligations among partners — how profits, losses, and advances are settled within the firm — as distinct from the firm's exposure to outside parties. Burrill's brevity here is appropriate; the phrase does not require extended definition, only placement in context.
No substantive divergence exists across historical legal dictionaries on this phrase. It is a Latin term of fixed meaning, and historical sources treat it uniformly as a locational or relational marker rather than a term requiring doctrinal elaboration.
What historical dictionaries do not do — and what researchers should supply for themselves — is explain the doctrinal stakes of the distinction the phrase draws. Knowing that a rule operates inter sese tells you the rule's scope; understanding why that scope matters requires familiarity with the underlying law of partnership, co-ownership, or joint obligation.
Encyclopedia Cross-Reference
The Law Mind Property Law Encyclopedia: Personal Property — Gifts (Inter Vivos, Causa Mortis — Delivery, Intent, Acceptance) [property_133] — relevant where inter sese arises in the context of co-ownership arrangements and the rights of co-owners among themselves with respect to gifted property.
The Law Mind Trusts, Estates & Probate Encyclopedia: Revocable Inter Vivos Trusts as Will Substitutes [estates_60] — tangentially relevant where trust arrangements involve multiple beneficiaries or co-trustees and the phrase describes their internal rights and obligations.