Definition
Jointly means acting together, in common, or in concert rather than separately or independently. When parties act jointly, their rights, duties, or liabilities are unified rather than divided — they share a single legal position rather than holding distinct individual positions.
In legal instruments, obligations described as joint bind all named parties together as a single unit. A joint promise or joint obligation requires all obligors to be sued together in a single action; no one party can be pursued alone for the whole. This contrasts with several obligations, where each party is individually liable for the whole, and with joint and several obligations, which carry both qualities simultaneously.
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Common Language
Modern common usage (Wiktionary): Together, acting as one; collectively.
Historical common usage (Webster's 1913): In a joint manner; together; unitedly; in concert; not separately.
The common meaning and the legal meaning are broadly consistent, but the legal term carries precise procedural consequences that the ordinary meaning does not suggest. Saying two people did something "jointly" in casual speech implies cooperation. In law, "jointly bound" historically meant that all obligors had to be named as defendants in the same action — failure to join all of them could be fatal to the plaintiff's case. The everyday sense of togetherness gives no hint of this procedural requirement.
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Common Confusion
JOINTLY vs. JOINTLY AND SEVERALLY: These are not synonyms. A purely joint obligation means all obligors must be sued together; a creditor cannot select one and pursue only that party for the whole debt. A joint and several obligation gives the creditor the option to sue any one obligor alone for the full amount, all obligors together, or any combination. Modern contracts and statutes frequently default to joint and several liability, which has caused the word "jointly" in older instruments to be misread as carrying that broader meaning. It does not. Researchers encountering "jointly" in historical documents should resist importing the joint-and-several concept unless the text expressly includes it.
JOINTLY vs. IN COMMON: Holding property jointly (as in joint tenancy) differs from holding it in common (tenancy in common). Joint tenancy carries the right of survivorship; tenancy in common does not. The word "jointly" in a deed or will does not always specify which form of co-ownership is intended, and the default rule varies by jurisdiction and era.
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Why It Matters in Research
The procedural weight of "jointly" has shifted considerably across time. Under common law pleading, a joint obligor who was not named as a defendant could plead that defect in abatement — meaning a plaintiff who sued fewer than all joint parties could have the action dismissed. Modern codes of civil procedure largely abolished this technical trap by allowing separate actions or by treating most multi-party obligations as joint and several by default. Researchers reading 19th-century cases about bonds, notes, or contracts must be alert to whether the court is applying common law joint-party rules or an early code provision modifying them.
In the tax corpus, "jointly" has a precise statutory meaning: married filing jointly is a specific filing status under the Internal Revenue Code with defined eligibility rules, liability consequences (joint and several liability for the tax shown on a joint return), and innocent spouse relief implications. The word there carries a full statutory framework that the dictionary sense of "together" does not convey.
In real property, instruments from the 19th and early 20th centuries using "jointly" to describe co-ownership require careful attention. Courts in different jurisdictions presumed different default tenancy forms when the instrument was ambiguous, and many states have since inverted those presumptions by statute.
Black's 2nd Edition's definition references California and Indiana decisions to illustrate the procedural rule — that persons "jointly bound" must be sued together. Researchers should note that both of those citations predate the widespread adoption of merged civil procedure codes that softened this requirement. The rule those cases describe may not reflect the law of those jurisdictions today.
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Historical Dictionary Support
Black's Law Dictionary (2nd Ed.) captures the core procedural meaning cleanly: acting together or in concert, holding in common or interdependently, not separately. Its emphasis on the consequences for enforcement — that persons jointly bound must be sued in one action — reflects the practical legal stakes of the term rather than just its descriptive sense.
The definition in Black's 2nd is narrower than what modern researchers may need. It addresses the obligor side (joint debtors, joint promisors) but does not fully develop the property dimension (joint tenancy, joint ownership) or the modern statutory dimension (joint filing status, joint venture as a tax or regulatory classification). Researchers should treat Black's 2nd as authoritative for the procedural-obligation sense in common law era documents but supplement it for property and regulatory contexts.
No significant divergence exists among the historical sources available here; the Webster's 1913 definition is consistent with the legal meaning at its core, differing only in the procedural detail that legal usage adds.
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Jurisdictional Note
The procedural requirement that joint obligors be sued together has been largely abolished or modified by modern civil procedure codes in most U.S. jurisdictions. Many states now treat obligations as joint and several by default unless the instrument expressly limits liability to a purely joint form. Property law defaults for co-ownership described as "joint" vary: some jurisdictions still presume joint tenancy when the instrument so states; others require express language of survivorship.
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Encyclopedia Cross-Reference
Filing Status — Married Filing Jointly (The Law Mind Tax Encyclopedia): Covers the specific statutory meaning of "jointly" as a tax filing election, including liability consequences and innocent spouse provisions.
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