Definition
A Latin conjunction meaning "when" or "at the time that." In legal usage, *quum* functions as a variant spelling of *cum* (in its conjunctive sense) and appears almost exclusively in Latin maxims and broadsides found in pre-modern legal texts. It introduces a temporal or conditional clause — "when [a condition obtains], [a legal consequence follows]." The term has no independent legal significance apart from its role in constructing such maxims.
The most frequently cited maxim in which the form appears is:
*Quum de lucro duorum quæratur, melior est causa possidentis* — "When the question is as to the gain of two persons, the title of the party in possession is the better one." This maxim, drawn from the Digest (Dig. 50.17.126.2), encodes a foundational principle of possessory preference: where two parties assert competing claims to a benefit and neither has a clearly superior title, the law favors the one who already holds possession.
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Common Language
Modern common usage (Wiktionary): *Quum* is identified as an archaic or variant form of the Latin conjunction *cum*, meaning "when," "since," or "although," depending on context.
Historical common usage (Webster's 1913): Not separately entered; treated as a spelling variant of *cum*.
The gap worth noting: in ordinary Latin, *cum* can be temporal, causal, or concessive — "when," "since," or "although." In legal maxims, however, the word almost invariably operates in a conditional-temporal register. Researchers encountering *quum* in a legal text should read it as "when [a legal condition is satisfied]," not as "since" or "although," unless context clearly signals otherwise.
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Common Confusion
*Quum* and *cum* are orthographic variants, not distinct words. Older legal printers and copyists used *quum* to reduce ambiguity with the preposition *cum* ("with"), which takes a different grammatical construction. The two forms appear interchangeably across editions of the same source. Researchers who index or search historical texts by keyword should query both spellings. Similarly, *quando* ("when") serves a parallel function in many maxims and is sometimes used where *quum* or *cum* might equally appear; Burrill's own entry directs readers to check under all three forms.
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Why It Matters in Research
*Quum* is a navigational term, not a substantive one. Its value in the Law Mind corpus is almost entirely indexical: it marks the opening word of a class of Latin maxims that state conditional rules of law. A researcher who encounters *quum* in a historical treatise, digest, or pleading is almost certainly reading a maxim, not a term of art.
Several research traps are worth flagging:
**Spelling inconsistency across sources.** Pre-nineteenth-century legal texts alternate freely between *quum*, *cum*, and occasionally *quom*. Burrill himself cross-references *cum* and *quando* for related maxims, signaling that no single spelling captures the full set. Any keyword search in historical corpora must account for all variants.
**The maxim versus the principle.** The maxim *Quum de lucro duorum quæratur* encodes the possessory-preference rule, but that rule has a long downstream life in equity and property law under entirely different vocabulary — "possession is nine-tenths of the law" being the most familiar vernacular reduction. Researchers tracing the intellectual history of possessory preference should not stop at the Latin form.
**Digest provenance.** The citation to Dig. 50.17.126.2 locates the maxim within Justinian's Digest, specifically in the title *De diversis regulis iuris antiqui* ("On various rules of ancient law"), which is a compendium of general legal principles assembled from classical jurists. Maxims drawn from this title carry the weight of civilian authority and appear repeatedly in common law treatises that drew on Roman sources — particularly in property and commercial law contexts.
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Historical Dictionary Support
Burrill's Law Dictionary is the only shelf source to enter *quum* as a separate headword, and the entry is brief: a definition ("when"), one maxim with translation and Digest citation, and a cross-reference to *Cum* and *Quando* for related material. This is consistent with Burrill's general practice of giving variant Latin forms their own entries while concentrating substantive discussion elsewhere.
No other major historical legal dictionary in the Law Mind corpus enters *quum* independently. Black's and Bouvier's treat the relevant maxims under *cum* or under the substantive topic (possession, lucrum, etc.). This reflects a gradual editorial rationalization — later dictionaries consolidated Latin variants under canonical spellings, making older sources the more reliable place to find entries under *quum* specifically.
The Digest citation (Dig. 50.17.126.2) is accurate and traceable. Researchers using civil law materials should verify the fragment in standard Digest editions, as numbering conventions vary slightly across editions.
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Jurisdictional Note
As a Latin conjunction rather than a term of art, *quum* has no jurisdiction-specific meaning. The maxim it most often introduces (*Quum de lucro duorum quæratur*) has been applied in both common law and civil law jurisdictions as a statement of possessory preference, but its weight varies: civil law courts treat Digest maxims as authoritative sources; common law courts typically invoke them as illustrative principles rather than binding rules.
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Encyclopedia Cross-Reference
Law Mind Encyclopedia: Latin Maxims in Legal Texts; Possession and Possessory Title; Roman Law Sources in Common Law Tradition
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